The full changelog can be viewed on the Patch Notes page.
Here is a small preview of some of the maps in 2.2:
Fortress Forever is a Source Mod inspired by Team Fortress. Our independent team has created this mod entirely from scratch. Fortress Forever should please those who have stuck with or been a part of QWTF and TFC over the years while at the same time doing more for new TF players than any prior Fortress attempt.