Release notes are on Sprint's support website - they never appear on the HTC site that I've seen.
From yesterday morning:
Originally Posted by EarlyMon
Initial revision - 6/24 - 1.11.651.3
Updated rev - 6/24/ - 1.13.651.7 - Description: This update fixes issue of calendar entries in certain formats force closing during edits
That's all they say there.