The only way to get Iris Pro 5200 is to go to a 47W quad core CPU. That's a pretty big jump up from the 28W CPU benchmarked here or the 35W CPU in the current rMBP, so pretty unlikely.
i looked through Intel's processor database.
apparently the current Ivy is 45W
http://ark.intel.com/products/71459
and
http://en.wikipedia.org/wiki/List_of_Intel_Core_i7_microprocessors
So...a 2W jump is reasonable i guess