I've been reading that the 2 screen setup is gonna be used to show games in a "true" 3D look. Something about tricking the eye into thinking its 3D. People should be able to distinguish between a 2D GBA (next name here) and the DS. I want to wait for people's comments after E3 if this is true. I bet people will call it the biggest gimmick ever. Then Sony or MS will announce something similar and will be considered the best thing ever thought of
But don't take anything personal. I'm just having a little fun there at the end.