The rumors surrounding the iPad 2 keep coming through, and this one comes from the iBooks 1.1 source files as MacRumors reports, which have an image called Wood Tile@2x.png.
What's interesting is that it's a 1536 x 800 file, which is considerably higher than the 764 x 400 of the original iBooks. That's double each way, which is 4x the resolution. You know what else? The rumors of the A5 chip's processing power, which we heard this morning, definitely support the possibility of that happening.
Interestingly, the bookmark image is also doubled:
Image from MacRumors
In case you are a bit lost on the whole iPad 2 thing, why not take a chance to get caught up on the rumors here.