Features include a custom sidebar with personable widgets, quick capture mode, timer and burst modes, built in voice triggers for when you say "cheese", light meter ring, focus ring, swipe enabled review drawer, swipe to delete unwanted photos, video snapshots while recording, refocus video, auto photo enhancing feature, 360 degree panorama, and much more.
This is still considered unstable. The stock camera will remain in CM builds until Focal has been made completely stable. There are no plans to make this a market app for the time being so you will need to install Cyanogen Mod in order to try Focal for now.
Via +CyanogenMod