Currently, 'canon' consists of the active franchise and upon what it relies.. which consists of only the material present within the 2009 movie.
Or more accurately, everything seen on screen before is canon until the new people in charge of the franchise declare that it's not anymore.
The thing is, the new people in charge not only did not declare that all past Trek series/movies aren't canon anymore, they went on record to say that the prime universe still exists and is doing fine despite the fact that there's a new universe that their stories will take place in. I believe that was the whole point of the time-traveling aspect of ST'09, rather than just claiming that it's a complete reboot. If not, then there'd be no need for Old Spock.