Hmm... this is further confirmed by MS statement on May NPD data:
Xbox 360: E3 bound
• Last month we showcased an all-star lineup of games including “Gears of War 2,” “Fable 2,” “Banjo and Kazooie: Nuts and Bolts,” “Viva Piñata 2,” and “Too Human.” We still have quite a few aces left up our sleeve; see you at E3 next month!
Link: http://gamerscoreblog.com/press/archive/2008/06/12/559591.aspx