Don't hold out too much hope
As soon as early bugs have been ironed out is when the last of the updates you are likely to see will arrive. About the most you can expect is until the manufacturer gets their next model out on the shelves. When even Google break their promises and dump their Nexus 7, expecting support from other manufacturers is asking a bit much. Nexus purchased in September 2012, last update at beginning of 2015. Two and a half years for a device that was theoretically meant to be bang up-to-date for its entire life (battery still able to hold at least 80% of as-new charge, so a good while to go yet). Might as well get the cheapest no-name unit with the latest OS and replace it each year. For the same money, you stay up to date for 5 years.
Biting the hand that feeds IT
