Gears/Fable/Fallout will sell 3 million+ each, with Gears selling more. They are exactly the type of product that sells.
Banjo? I'd say flop. But we dont even know what the game is yet, but I cant imaine it doing well.
Too Human is a complete unknown at this point. Some previews say it'll be good. Others are skwptical. If it's halfway decent, 80+ metacritic it does 2 million due to lack of competition.
Ninja Gaiden I dunno what to think. First was pretty hardcore. Maybe a million? More if it is approachable and it catches fire word-of-mouth wise. Not much more than a million if it is too hard.