Quoted from vid1900:They don't want you waiting for Iron Maiden this fall, if they can sell you an Aerosmith today.
My thoughts precisely. I don't think it makes much business sense to announce a game that will surely take sales away from your most recent release. Maybe they weren't expecting Aerosmith to get such great praise and are cashing in while they still can. SW will sell because of the license even if it flips like a turd.