JCVD is the main villian in the movie and will have the big ending fight against Stallone.
Yep that's what I read. I think that Willis and Arnie will probably only show up for one big fight/gun scene though.
Who knows though, it is Arnies first film back so I wouldn't be surprised if he has a large role.
From WIKI:
Jean-Claude Van Damme as Jean Vilain
Primary antagonist and the leader of an opposing team of mercenaries. Van Damme had previously been offered a role in The Expendables but failed to come to an agreement with Stallone and ultimately never took part. Commenting on the role, Stallone said "We’ll have a big showdown between me and Van Damme, which has been anticipated for a long time, so it should be a good one."
Bruce Willis as Mr. Church
In late August 2011, Stallone stated his interest in having Willis return for a role in the sequel — expanding upon his brief cameo in the original — potentially as a "super villain". Willis was confirmed to be involved in a "substantial" role on September 6, 2011. Commenting on the film, Willis said "Hopefully, they'll start shooting it while we're young enough to survive."
Arnold Schwarzenegger as Trent Mauser
Stallone noted his intention to have Schwarzenegger return for a sequel before the release of The Expendables, stating "If this works, I would love to get him in the next one". Schwarzenegger's involvement was confirmed on September 6, 2011, his "substantial" role expanding on his cameo in the original film. Schwarzenegger filmed his scenes in 4 days.
