Leakster says: Android 7 Nougat coming to the HTC 10 in Europe really soon
According to ROM developer and HTC leakster with a respectable track record LlabTooFeR, European HTC 10 units will receive its major Android 7.0 (not 7.1?) update by the end of November or the beginning of December. Nothing is said about the US crowd, but we don't imagine it would take long for the new software to cross the pond. Unless your phone has been issued by a carrier — that usually results in some delays.
What's the big deal? Well, Nougat brings about new features, such as "App Shortcuts" (long-press acts like the iPhone's 3D Touch), actionable notifications, multi-window, better Doze mode, and lots more. Being a relatively light Android re-skin, Sense is most likely to benefit from those features.