Previous LTS point-releases came with a renamed Mesa backported from the latest release (as in mesa-lts-wily for instance) . Among other issues this prevented providing newer Mesa backports for point-release users without getting a mess of different versions.
That’s why from 16.04.2 onwards Mesa will be backported unrenamed, and this time it is the last version of the 12.0.x series which was also used in 16.10. It’s available now in xenial-proposed, and of course in yakkety-proposed too (16.10 released with 12.0.3). Get it while hot!