The Government has posted CivTAK 3.10 here. (This is an official DoD web site with a trusted download source).
The site that hosts CivTAK, Evr2est.us also provides updated, responsive satellite imagery for locations experiencing emergencies (e.g. forest fires, floods, etc), which can be imported into ATAK.
The coolest new feature in this release is the ability to import and display 3D models from sources like Drones (e.g Pix4D, DroneDeploy).