I pre-ordered the i5 256GB model, and it's mainly as a desktop replacement (yes, laugh!), for everything other than video import and encoding, since most everything I do these days doesn't really require lots of power.
But I'm still curious about the i7. I read a bit about it recently, and it seems oddly balanced in terms of CPU processing, GPU processing, and TDP balancing. For example, the HD5k really bumps up the temp output on the chip, and that tends to force the CPU cores to downclock a lot to balance. I.e., even with double the processing cores in the GPU, overall performance might not benefit because the cores can downclock even below the speed of the i5 counterpart (4600U). That, coupled with the i7 having a lower base and is also just a dual with HT, I don't quite understand what real benefit it brings, definitely not when considering the price premium over the other models.