Just went through SLC and, while the airport was its usual miserable self, I thought they did an excellent job of updating all the signage. It wasn’t just stickers - permanent signage indistinguishable from the old was in place, and all the details (like gate podium displays, app, etc.) had been covered.

Notably, the signage is the same 1992-style font and coloring - I assume the new airport will have a modern look and feel, but they aren’t partially rolling that out for now (ehich is probably wise).