HTC America president Jason Mackenzie today stated that owners of the One 2013 should be able to download Sense 6.0 by the end of May. He noted that this concerns only users in the US and Canada, so folks in other markets may not receive the update that fast.
Sense 6.0 UI comes with a fresh design, enhanced BlinkFeed, updated gallery and Sense TV, and more. Last year’s HTC One mini and One max will also receive Sense 6.0, but HTC didn’t say exactly when it’s going to happen. In case you own an HTC Desire model from 2013, it doesn’t look like you’ll be able to get a taste of Sense 6 - at least not officially.