This, according to smartphone leaker @evleaks, is HTC's "M8 Ace," presumably another member of the 2014 HTC One family. Besides this blurry render, there's no further information on what's going on here, though we're apparently looking at a handset with front-facing speakers (and a curious new grille styling) running HTC Sense 6.
The "M8 Ace" was mentioned by the prolific Twitter leaker shortly after the HTC One M8's announcement, along with word of an "M8 Mini" that's since cropped up in further online leaks. Based on that, and the proportions in the image above, we'd speculate this might be an M8 with a larger screen, though there's really not much to go on.
Any wild theories of your own? Shout out in the comments.