A big focus right now is working out a way to make priest spellcasting work more similarly to the original Dark Sun setting so as to differentiate it more from wizard casting. With the playtest underway, it is possible there will also be a campaign setting released eventually as well as detailing how best to construct city states and a map "shell" for GMs to put their cities into. I will also more than likely implement a more general system of supplies (instead of keeping track of usage dice) and procedures for making camp to codify survival procedures better while still keeping things simple.
Thanks for your reply! I'm glad you like it so far!