Depends on what you want to use it for I guess. Most of this "revolution" doesn't seem to me to have much to do with actually reading e-books. The actual reading part, the i-ink display, is already really good (IMHO). Touch screens, colour, web browsers etc. all seem aimed more at creating multi-function devices than improving the devices as actual e-book readers. It's a bit like how cell phones have transformed into cell phone/mp3 player/web browser/picture viewer/movie player. They don't work any better as phones though
I'm planning on buying my first e-reader shortly and certainly won't wait more than a few weeks for the next great thing. If B&N announce next week that they'll have their new reader available before Thanksgiving, I might wait to see what that's like, but that's my limit. I'll choose between that, the Irex DR800SG, the Sony PRS-600 and the Kindle 2. What's been holding me back so far was a certain nostalgic reluctance to give up paper books, which I really enjoy. However the enthusiasm of friends and relatives for their e-readers (all Kindles actually), has convinced me that I should at least give this a try.