HTC Gallery update adds new Duo Camera effects for the HTC One (M8) and HTC Butterfly 25
The new typography includes templates for Title Slide, Magazine, Album, Calendar and Movie. There are also some unamed changes that HTC One (M8) and Butterfly 2 users will stumble across while using these features.
The HTC Gallery app update does show how manufacturers (and by extension, customers) find it much easier to have system applications updated in the Google Play Store instead of waiting forever to have them included as part of a carrier sent update. If you own either phone, have you installed the update yet?
source: HTCGallery via AndroidCentral