There will be a LOT more choices! They seem to be coming out of the woodwork. So long as it has something like the eink it will be OK. It's not that we wanted the reader, our Eee's will display any books just fine, it's the screen and power usage that drew us into the current readers.
Take a look at the one in the photo! It is much more like a normal book. Has pages on both sides and closes like a book when not in use. I am not a Microsoft fan, but I guess I do like toys.
Greg