i dont think that there'll be any revisions just yet. the shuffle was the latest, and they'll keep making those for at least 6 months.
maybe closer to the iPhone release date they might get a touchscreen iPod out there..but don't expect any capacity changes...those will come about a month AFTER the new t-s ipod...they make more money that way. just like the macbooks! the first macbooks, the base model was a 1.63Ghz! Then they just kept upping the speed and the memory over the months.
a simple tactic, but oh so profitable.