I suggest waiting until Oct. 2nd to hear what Sony has to say, see
New Chapter on Digital Reading. There is a chance that they will announce an upgraded Reader with WiFi.
Almost all the big EInk news seems to be for next spring, but WiFi/3G is something that could be added to existing designs for the Christmas season. It isn't clear that Astak is going to do this (on their initial readers) by the way. Part of the problem is that WiFi is just the hardware, you also need one or more ebooks stores (and other providers, e.g. newspapers) to allow direct downloads.