I believe that until we get coloured eInk devices, or some other BIG jump in technology, it is largely going to be a matter of tweaks for readers--regardless of the brand. And with the time in the pipeline and the changes in technology that may not directly be related to eReaders, it can't really be said, with any degree of certainty, that reader A is borrowing from Reader B, though it can definitely be said that one came before the other
