Sense 5.5 brings new features to BlinkFeed, including Google+, RSS and search support — and yes, the option to turn it off entirely
There's also a redesigned Gallery app with new video highlight templates and options. and now has an animated GIF maker, Zoe photos have more themes and audio options…
A new menu for customizing and re-ordering the quick settings in the notification shade, and new options here include a "Do Not Disturb" mode.
In addition, the HTC keyboard features some new emoji icons, and the task-switcher has been re-scaled with bigger preview windows.
The camera app has grown two new features — "Panorama+" and "Dual Capture."
(Info shamelessly ripped from google)