The V810 (V850, V900) replacement for Polar’s successful V800 triathlon watch has been semi-confirmed for Spring 2018 by Stan Brajer, SVP Sales and Marketing (Polar, US)
Source: Interview at http://www.babbittville.com/radio/ just after 11 minutes
However my best guess, as of 21Jan2018, and based on various rumours, is that this date will likely slip. Maybe to Q2 or beyond. If Polar are not in a position to ship by May 2018 then it will be more than likely that the announcement will then not be until approx September 2018. release dates tend to be around the start of the racing season (spring) or spending season (Christmas!). Some rumours also suggest that, perhaps, you should not expect the obvious.
Polar strategist, Suvilaasko, is now on record as saying “We definitely see that space is going to be active going forward” when talking about the mid-range Polar M600 AndroidWear smartwatch. So Polar may be working on a mid-range running watch as well as a tri watch.
Edit: Source Wareable.com
I think it will be reasonable to expect a high-res colour screen and 6-LED oHR on an updated V800. But what else? thoughts (here) and below if you want to comment. They key unknown is whether Polar are merely updating the V800 with a few components, like they have done with the M430, or if they are re-inventing the watch eg including ANT+