I'm waiting. My iPad 1 now can't run quite a few things and is orphaned in software. The Mini has (to my understanding) an iPad 2 CPU, meaning it is more likely to be orphaned soon as well. That's clearly speculation, but that on top of Retina has me waiting. The Nexus 7 is very tempting should they not release one with Retina by November.
I do have a wifi Mini and I love it. But my daughters have pretty well claimed my 2 iPads as their own. So I plan to get a cellular Mini when the next model is released which they will not get their grubby little fingers on.