Isn't OLED rather energy inefficient (at its max lumen) and low lumen (so it needs max brightness a lot of the time)?As I wrote above I think it has EVERYTHING to do with that patent...
I'll go out on a limb and tie two other rumors together... In a move similar to Amazon's two Kindles will announce TWO tablets, one with a plastic case and an OS level advertising supporting a 3G connection and a second one in an aluminum unibody and standard 3G contract... the higher end model maybe getting an OLED screen too.
Maybe it will be a Pixel Qi screen.