Here are some of the features added in recent Kindle firmware releases for those interested:
- 5.10.1 Save multiple sets of reading settings
- 5.10.2 Enhanced DRM for KFX format (unbroken)
- 5.11.2 Kindle User's Guide 11th Edition
- 5.12.1 Read from "before you go" screen
- 5.12.2 Read Now from the store and for KU/Prime Reading, No widows/orphans in KFX
- 5.12.3 Library badges for Prime and KU books, KFX widows/orphans controlled by publisher