We got word that HTC was trying to develop a somewhat different OS for the Chinese market, and what you see above may just be it. Although many are speculating that this screenshot is actually Sense 5.5, which very well could be the case due to the similarities to how Sense 5 looks.
To me, it looks very Sense-like indeed, with a few colors changed around and some toggles thrown on the layout. Has a Google Now card like feel to it as well, so if this is what they are planning for the Chinese market, maybe they should incorporate some of this within Sense 5.5. We will keep you posted on what we find out about this.
Source: Android Community
