Well that's a quad core vs dual core which a whole different issue. I guess my question was whether a dual core i3 and a C2D running at the same clock speed were really equally fast, but it looks like I've already been answered on that.
In light of recent events (such as the nearest BB with a mini being in Erie, PA, 128 miles away) I've converted from the ranks of the skeptics. What are the chances of the new mini dropping to $599 with perhaps a bare bones i3 processor, perhaps 2.50GHz i3-2100T with Intel HD2000 graphics, 4GB RAM (min for Lion is 2GB and I can't see Apple going with the bare minimum there), and about the same HDD size as now or maybe smaller? Power users will not like that one bit but with the US economy sputtering and the expense of TBolt might force them to lower the price and lower the expected specs even more.
And the main target market for the mini probably won't care about any of this other than the price tag and the catchy processor name.