The top priority for the Defiance team is fixing weapons -- all of them. Dempsey said that the team is examining the "core balance" of all of the weapons and sorting out rarity and bonus issues. "Higher rarity weapons will always be accompanied with celebration and never disappointment," he promised.
The team is also looking to tweak and improve shields, inventory, objectives, the UI, and especially the chat system. Dempsey ends his letter teasing the upcoming second DLC, the details of which he says will be coming "soon."
[Thanks to Etaew for the tip!]