Strikeforce heavyweight champ Alistair Overeem and Bellator lightweight title-holder Eddie Alvarez were among the winners on Sunday at DREAM 12 in Osaka, Japan.

Overeem submitted James Thompson with a guillotine choke in under a minute in the DREAM 12 main event, while Alvarez used an arm-triangle choke to defeat Katsunori Kikuno in the second-round of their featured matchup.

All eighteen fighters scheduled to compete at tomorrow’s DREAM 12 event in Osaka, Japan hit the scales earlier today to weigh-in for their bouts. Lightweight Won Sik Park was the long fighter on the card who failed to make weight on their first attempt, with notables Alistair Overeem, James Thompson, Eddie Alvarez, Kazushi Sakuraba, and Chase Beebe all hitting their marks.

Lightweight fighter, Chris Horodecki is expected to sign with the WEC very soon. Jeff Curran has recently signed a contract with Strikeforce. Middleweight Robbie Lawler is expecting a December return to action in Strikeforce.

Details on these stories, and many more in our MMAFrenzy Quick Hits.

Strikeforce heavyweight champ Alistair Overeem, who has yet to fight again for the promotion since winning the title in November 2007, returned to MMA action overseas over the weekend, dominating Tony Sylvester at Ultimate Glory 11 in Amsterdam, Netherlands before finishing the fight with a guillotine choke in just 83-seconds. Overeem will fight again this weekend at DREAM 12 against James Thomson before he’s expected to return to Strikeforce to defend the title.

Read about the latest Strikeforce news after the jump, including additions to “Fedor vs. Rogers”, the main card for Strikeforce Challengers 5, and more.

The officials over at FEG and DREAM officially made an expected announcement today that they will be holding their annual New Years Eve show again this year, at the Saitama Super Arena in Saitama, Japan. K-1 executive Sadaharu Tanikawa said that the event would follow last year’s hybrid format, including both K-1 bouts and Dream MMA bouts, to fill out an eighteen fight card.

The previously reported bout between Alistair Overeem and Sam Hoger, slated for an upcoming Shooto event, has been scrapped. Overeem will instead face Tony Sylvster at the Oct. 17 Golden Glory event in Amsterdam.

Strikeforce heavyweight champion, Alistair Overeem, is likely to return to MMA action soon, against former “The Ultimate Fighter” contestant Sam Hoger in the Japanese promotion Shooto. Overeem was twice schedule to defend his Strikeforce belt over the summer, but a hand injury suffered in a bar fight forced both match ups to be scrapped. He has been absent from MMA, competing only in K-1 since November of 2008. According to a report by InsideFights, Overeem and Hoger have verbally agreed to face one another, though the official bout agreements have yet to be signed.

The bracket for K-1’s World Grand Prix 2009 Final, which takes place on December 5 in Kanagawa, Japan, was set on Sunday in Seoul after the tournament’s eight fighters were determined in Saturday bouts at the K-1 World GP 2009 Final 16.

Badr Hari takes on Ruslan Karaev and Ewerton Texeira meets Alistair Overeem in side A of the tournament, while Jerome LeBanner fights Semmy Schilt and Remy Bonjasky squares off against Errol Zimmerman on side B.

The Japanese promotional group FEG, which runs the Dream MMA events, has long be suggesting that they had a big surprise in store for their already announced Dream 12 event, which will take place on October 25 in Osaka, Japan. They had already released a short promotional video in which were a few shots of a cage which led some people to believe that would be the surprise. Those people were correct, and Dream has officially confirmed that with a new promotional video for the event (included below).

Fedor Emelianenko’s recently-announced deal with Strikeforce is an exclusive contract for three fights over one year, according to Strikeforce CEO Scott Coker, who discussed a variety of Strikeforce topics yesterday on TapouT Radio and the Carmichael Dave Show.

Coker said Strikeforce is planing a Thursday press conference to announce details on Fedor’s debut, and also announced that Jake Shields will be fighting for an interim middleweight title in October and that Strikeforce had formed a “alliance” with DREAM.

Affliction’s Tom Atencio has confirmed to Fanhouse that, as previously reported, Josh Barnett is out of his Affliction: Trilogy headliner against Fedor Emelianenko after a pre-fight drug screening was positive for a banned substance

Atencio declined to reveal what substance Barnett tested positive for and went on to say that, although the main event is no longer intact, “at this point” the event is still expected to take place.

Strikeforce heavyweight champion Alistair Overeem has withdrawn from his scheduled August 15 title defense against Fabricio Werdum as his hand has still not healed from an injury suffered in a May altercation at an Amsterdam nightclub.

Fanhouse was first to report the withdrawal on Tuesday, adding that Overeem will remain on the card against a different opponent, with it yet to be decided whether an interim title will be on the line for the new matchup.

Strikeforce today announced that the promotion’s heavyweight title-holder Alistair Overeem will defend his title against Fabricio Werdum at its August 15 “Carano vs. Cyborg” event in San Jose, California.

The long-rumored matchup is the third championship bout on the Showtime-televised card, joining Gina Carano and Cristiane “Cyborg” Santos, who meet for the newly-created Strikeforce 145-pound Women’s Championship, as well as a lightweight title unification and rematch between Josh Thomson and Gilbert Melendez. Nick Diaz vs. Joe Riggs is also expected to be featured on the event’s main card.

A heavyweight matchup between Andrei Arlovski and Brett Rogers has been added to the lineup for Strikeforce's June 6th event in St. Louis, the promotion confirmed on Tuesday.

A heavyweight championship bout between current title-holder Alistair Overeem and challenger Brett Rogers as well as a middleweight bout between Joey Villasenor and Evangelista "Cyborg" Santos are the latest additions to Strikeforce's June 6th event.