I've seen quite a few threads about this around the interwebs, but no solutions.
I'm migrating from a 2012 15" rMBP to a new (as of yesterday) 15" rMBP, and am having issues with Win7 x64.
I used Winclone to image the Windows partition om the old machine, transferred it to the new one, repartitioned everything, and restored the Winclone image. That seemed to work fine; all the files are where they should be. After recreating a VM in Parallels, I can boot the partition successfully.
However, I can't boot directly into the Bootcamp partition. At the login screen, the keyboard and trackpad are nonfunctional. I connected an external USB keyboard, which didn't help.
So, I used Bootcamp Assistant to create a Win7 installer USB stick, and booted off of that. Same thing: When it gets to the first GUI screen, input devices are nonfunctional.
I need the 750 GPU for several reasons, and would hate to have to return this thing.