Wave and AP25 have nothing to do with each other- it is just a coincidence that they arrived about the same time (indeed Fable 3 which has AP25 is wave 6).
Alas last night we saw the release of Assassins Creed Brotherhood which has AP25 and is wave 8 or 9 (not sure which) which means if you try to use it you will be updated to the kinect dash and AP25 becomes an issue. It also means most games from now on probably will be the kinect dash (not that there are many releases for the rest of the year- hopefully enough time for LT+ to arrive).
To answer your question- do not update as you gain nothing for it.