The next flagship phone from HTC is scheduled to be the HTC Ocean a.k.a HTC U. This is the device that should replace the HTC 10. @evleaks has shared a photo of the HTC Ocean in the same super glossy back as the HTC U Ultra.
The phone appears to have the same proportions as the HTC 10. The home button is a rounded rectangle that should double as the fingerprint scanner. The back has the camera and flash. Power and volume buttons are on the right side. Another thing that remains from the HTC 10 is the big bezels. The major difference is obviously the glossy glass.
Some of the rumored features include pressure sensitive sides so you can literally squeeze the phone to perform tasks. Some early specs include Snapdragon 835, 4GB of RAM, 5.5-inch display, and a 12MP camera. We should learn more about the HTC U later this month.