That would make it noticeably taller than, say, an LG V30 – another phone with a 6” 18:9 screen. Thicker too, though @LlabTooFeR (who knows a thing or two about HTC phones) suggests that the U11 Plus will have a batter capacity around 4,000mAh. If that is the case, we’d be quite happy with a 9.1mm phone.
Plus, the regular U11 is 153.9mm tall already so this isn't that much of an increase for the extra screen. The fingerprint reader had to be moved to the back, however, to free up some space (and you won't hear us complain about this either).
The renders definitely show ample bezels on the front – and stereo speakers. With that in mind, the height of the phone makes sense, it’s as tall as the Pixel 2 XL (which is based on the V30, but has stereo speakers as well).
The HTC U11 Plus will likely be unveiled on November 2. Here’s a quick recap of the specs: 6” QHD+ screen, Snapdragon 835 chipset, 12MP main camera, 8MP selfie and the up-to-date Android 8.0 Oreo.