Hello!
In this update, /ps unclaim was added, allowing for players to unclaim their region without needing to find where their protection stone is. The rarely used /ps reclaim was also removed, with its functionality being reimplemented in /ps unclaim.

Data types in block names have also now been officially removed, since all of the blocks are covered by the material list now. This should have been done in 1.8...

Internally, some major changes were done to prepare for adding new features in future updates:

• Actionbar/titles when entering regions
• Configurable messages in messages.yml

Thank you!