I would like them to make the game stable again. As it stands the force closing of the app when interacting with gyms due to memory leak is unexcusable and should be fixed.
Once the game is stable, then there should be talk of other updates to the game. Although right now I would just like to see some rebalance with movesets and pokemon so we don't see the same 5 in every gym. Also would like to see the legendary birds released but have them unique to the team you choose (i.e. only Instinct can get Zapados, etc.)