I REALLY hope that Bookeen doesn't come out with a Gen4 soon, simply because I haven't even gotten my Cybook in the mail yet and I'm not too eager for it to be out of date :P
I would LOVE some new firmware however
C'moooon folders!
Anyways, all the suggestions made so far are good ones, but navigation > wi-fi imo. For me it's all about the reading experience, since that's what I'll spend most of my time doing. I don't really care if it takes me an extra few minutes to download books (although I guess wi-fi is nice for news).