TWRP 188.8.131.52 is out now for all currently supported devices.
What's new in 184.108.40.206:
- Fix daylight savings time rules for USA and Europe (_that)
- Allow mulitple overlays for popup boxes (Dees_Troy)
- Add pattern style password entry for decrypt (Tassadar)
- Keyboard improvements (_that)
- Update AOSP base to 5.1 (Dees_Troy)
- Reduce theme count to 5 and rely on scaling (Dees_Troy)
- Various scaling improvements (Dees_Troy)
- Improved handling of resources in the GUI (_that)
- Make scroll bar size proportional to list size (_that)
- Allow scoll lists to render without a header (_that)
- Make console scroll per pixel with kinetic scrolling (_that)
- Support styles in XML to reduce XML size and improve consistentcy (Dees_Troy)
- Various other fixes and improvements (mdmower, bigbiff, codelover, etc)
Head over to the devices page to find install instructions and download links.