Now both versions may have appeared in a photo leaked by frequent Twitter tipster @evleaks, who now goes by his real name, Evan Blass.
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The new phones in the photo appear similar but for the button or sensor - possibly the M9 Plus's fingerprint reader - below the display on the righthand one.
Other than that they feature a very similar look, with their glass-and-metal frames, tiny bezels and sleek curves - features that make these two new HTC devices look very close to the iPhone 6 and iPhone 6 Plus.
Imitation over innovation
That's kind of a shame, considering how well HTC has done in the past carving out its own unique aesthetic niche, particularly with the HTC One M8 and its predecessors.
Previous leaks have suggested that the new HTC One would look more similar to those, but it was also speculated that the leaks we've seen so far were housed in dummy chassis so as to conceal their true natures.
The size thing
One possible red flag here is that the initial HTC One M9 Plus leak claimed the two phones are identical in size, the only difference between them being the fingerprint reader - while these two do appear to differ in proportions.
That may be just the extra space needed for the fingerprint scanner, though, as it appears their actual screens could have the same measurements.
These two alleged HTC phones do look sleek, but it's a fact that these images are unconfirmed, and that HTC's next flagship(s) might turn out to look completely different.
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Michael Rougeau is a former freelance news writer for TechRadar. Studying at Goldsmiths, University of London, and Northeastern University, Michael has bylines at Kotaku, 1UP, G4, Complex Magazine, Digital Trends, GamesRadar, GameSpot, IFC, Animal New York, @Gamer, Inside the Magic, Comic Book Resources, Zap2It, TabTimes, GameZone, Cheat Code Central, Gameshark, Gameranx, The Industry, Debonair Mag, Kombo, and others.
Micheal also spent time as the Games Editor for Playboy.com, and was the managing editor at GameSpot before becoming an Animal Care Manager for Wags and Walks.