I think another poster in one of the other threads summed up this upgrade pretty well - Laptop on a stick. The thing is Apple aren't on their own here as Windows OEM AIO computers seem to be popping up everywhere at present, with towers now an endangered species.
As I said in another thread, I don't hate the new iMac but I do prefer my mid 2011 model and TBH if this is the way Apple are taking the iMac then I'm tempted to go with a Mini next time around. I consider the latest Mini is starting to make the brand a quite attractive option. The latest bench tests show the new Mini matching the 2010 Mac Pro - now who would have thought you could put those two things in the same sentence?