I doubt very much there will be new mini's anytime soon. Apple can barely meet orders now and don't forget that the mini has only very recently been shipping outside the US. Buy now, enjoy it and forget about the other 2 gigs!
Plus, if you wait until new ones are announced, then you'll have to add on the shipping wait on top of that! You could be looking at a 8 month delay. If you want a mini, get it now.
Buy buy buy now! I don't get the mini over the reg. thing, but waiting is almost never worth it. It is at most halfway through the product cycle and it could be until next April. You'll be waiting 2-4 wks anyway from the looks of things.