New sat nav unit is a big upgrade from the current model MFD.
This is indeed the global model change which includes minor suspension and bushing tweaks, SpecV rear diffuser, wheel centre cap changes, more clear coat on front and rear bumpers as well.
The compact flash slot on the previous models is now gone and is replaced by a USB slot as you mentioned. Interestingly, the MFD can boot from and access this USB slot for software installation. Should open up the possibility of development of third party apps maybe. Nismo's MFD upgrade uses this tech to install itself in the GT-R after all. Hopefully apps don't need to be digitally signed by Nissan......
There's a whole computer in that MFD, if you can access it, there's a command line interpreter, POSIX like OS, 3G modem capabilities, etc. Would be very interesting to see if anyone puts some effort in to develop at the very least a data logging system ala Nismo but on the cheap / free for the community.
I'd do it but i dont have a GTR to test out my stuff...