The Expendables could quite possibly be one of the really special movie projects that we see in the near future. Written, directed, and starring Sylvester Stallone, the movie has attempted to gather pretty much every massive action star and put them all in one film. We still don’t know exactly what kind of movie it will be, but it sounds like it’s going to be pure, full-speed action with no rules — at least that’s how it feels like it should be done. While he wasn’t able to get all of them (Jean Claude Van Damme), he has put together one of the best action casts ever seen, and it has folks very excited to see what comes of it all.

Now comes word that two of the biggest action stars ever to live will be filming a small cameo for the movie with Stallone: Bruce Willis and Arnold Schwarzenegger.

Willis spoke to MTV News recently about if he’s filmed the “very special” cameo and what it might involve.

No word on what the cameo would involve, but wouldn’t it be super awesome if the two stars showed up as some popular characters that they’ve played before, if just for entertainment purposes?

The Expendables does sound similar to a Rambo movie, telling the story of a group of mercenaries who set off to kill an evil South American dictator and his men who have been wreaking havoc for a long time.

Joining Stallone in the main cast, is fellow ’80s star Dolph Lundgren, Jason Statham, Jet Li, Mickey Rourke, and Eric Roberts. Other cast will be filled by the action stars of wrestling and sports fame like WWE star Steve Austin and UFC stars Randy Couture and Antônio Rodrigo Nogueira, who are actually set to fight each other a week from this Saturday at UFC 102.

The Expendables is set for an April 23, 2010 release date.