From what I've heard Snake nor Sonic have been guarenteed, but Snake has a higher chance, considering:
Hideo Kojima asked for him to be Smash Bros Melee (but it was to late to add him so he wasn't)
Nintendo asked Kojima pretty much first thing if he wanted Snake in Brawl (to make up for missing Melee)
They put Raiden in Playstation Allstars because Kojima told them Snake's only fighting game will be Smash Bros.
Snake has got a lot going for him.
And I've never battled a person who was good with Sonic. That's probably why I don't care if he returns, I wasn't bad nor good with him, but no one ever used him to make me hate or like his fighting style.














