Why did Nintendo launch the 3DS in the middle of Spring with so little fanfare? Because the company has something bigger under its belt for E3. Think not-portable.
And speaking of 3D, expect a "D" in "Gears 3".
Project Natal will be big, but not as big as the legal battle you can expect to see hit immediately after it launches. You don't want to know what Microsoft did to get that tech.