Yeah and what makes you think they wouldn't change up Haggar?
Not saying that they can't change him up, just saying that it's unlikely.
Haggar's main thing is grappling. At best, they can make him a slow and hard hitting character with a command grab.
But why do that when there's already Birdie, A big slow character with hard hitting normals and high damage and a command grab, as well as Zangief who is the most grappli-est of them all.
Again, he can definitely show up but I don't think he'll show up for S2.
Plus there's also the fact that Ryu, Ken and Akuma are all fan favourites. Guile is also a fan favourite. Haggar is less popular than those characters who are almost considered the representatives for the series.
EDIT: So I suppose I kinda agree with you on the Season 3 stuff. Though my dream is that SF5 gets one Slam Masters character while MVC:I gets another.