For reference, we were west side upper deck.
Things that were improved:
Entry/Ingress: we were in our seats an hour before kick, but once we actually found Gate B (which has really shitty access and is wedged between the edge of the cotton bowl and an exterior building), we had an easy ride up the escalators to our seats.
Restrooms (slightly)
Walkways: they were less cramped than years past and expanded outwards?
Still needs improvements:
Squatters
Signage
Sound system (please don't make it Zillatron level pain but just enough to hear announcements)
Seat labels in our section were basically gone
Wifi/Cellular coverage: put up some temp towers Verizon/ATT! And yes, our focus is on the game not our phones but we also have kids at home that we're trying to stay in touch with...
As immamac said above if they pushed out the upper deck concourse another 25 feet all the way around, they could build a ringed walkway around the entire stadium, which would make room for more concessions, more restrooms, and better flow. It would probably cost $100MM too. Some of those buildings that abutt the stadium are ancient and are not what drive tens of thousands of people to the fair. Knock down and relocate the damn foot court building to make room for expansion of the stadium!