The mysterious U11 variant seems to have the same specs as the original U11, save for the reduced 4 GB RAM. If the GFXBench leak proves to be true, this would be the first HTC smartphone with an 18:9 display.
https://www.notebookcheck.net/HTC-U11-variant-with-6-inch-18-9-display-pops-on-GFXBench.258674.0.html