I could see them picking up Adobe systems. But I don't see that being super lucrative for Apple. Sony would be a lucrative acquisition, but they'd have to shell out some serious dough (Sony posted $72 billion in revenue FY2010), and I don't think Sony's investors would dig.
Disney is posting some pretty good numbers too, but I see them as being the most likely. They could definitely use the cash infusion that Apple could give them given the production costs of animated films being a limit as to how much they can put out in a given year.
Facebook really has no reason to sell out unless Marky Mark is just tired of making a crap ton of money.







