I just got the issue and it is pretty underwhelming.
I think it would have been more interesting to do a more in-depth history of the mag, where the industry's gone since they started publishing, interviews with designers, etc. instead of yet another "best games of all time" list -- which every mag seems to do once a year anyway.
It seems like way more space was devoted to Xbox360/PS3 previews (which are old news by this time) than any anniversarty stuff.
Also, the little bit in their letters section where they posted some responses from their message board as to what game was better between Space Invaders and Asteroids reminded me of why I avoid their boards like the plague...