A short list of the seemingly big differences I've observed in the capital this summer as compared to last summer:
Many more flip-flops (both sexes)
Many completed construction projects in high traffic pedestrian areas
Shutting down unlicensed knick-knack vendors in the tourist area
Installation of interactive maps at some metro stops
Declaration of the plan to build a metro stop at the national bus terminal
Some Azerbaijani men wear shorts now...It happens.
I saw a girl skateboarding. Only one girl, but still.
Opening of Baskin-Robbins ice cream
Malls. A lot of new fancy shopping malls.
Wider availability of Georgian beers
If a PCV or AZ person reads this and thinks of others, let me know.