I'm guessing the mini might be updated soon to a 5 or 6GB drive. Hopefully it will have support for voice recorders like the iTalk (or even built-in, I wish). But I'm not sure about the regular iPods, or even the Photos. Probably nothing on them for awhile. I've heard rumors of HP being unhappy with their arrangment with Apple and it being about a rumored $50-100 price cut, so I'm sure we'll see in a couple of months. If you want it now, buy it now. Otherwise, if you can wait, you'll probably only be saving about $50-100 as I don't see any major changes for awhile. But who knows, maybe the next version will have a better battery or screen of some other new feature we don't even know about.
Keep watching the rumors, though I suspect they may slow a bit thanks to the lawsuits and all. 😛