For now, I would file this as a rumor. Even though it comes straight from Sylvester Stallone (isn’t the internet wonderful!) the way he words it, seems like it might be a joke. Of course it’s hard to read emotion and inflection through a short sentence, so it’s all up in the air.
From Stallone’s Twitter: “Had dinner with Bruce Willis last night. I want him in EXPENDABLES II as a super villain. What do you think?”
Personally I think this would be a great idea, especially since his role in the first film was woefully short. It’s not that far of a stretch either seeing as how his character now is somewhat of a question mark. He’s shady and not totally on the level, so it might be cool to find out in the next film that he’s this massive bad guy who ends up double-crossing Stallone and his group.
I think this could be a very fun casting choice and would open up even more story possibilities. Maybe Bruce Willis’ character has his own group of action hero tough guys as his evil henchmen? Obviously with the sequel still in early stages, any story ideas are up in the air, but this is one bit of casting news I hope comes true.