Uh...this isn't the first game they have done this. They revised the score of Battlefield 4 after it came out, so this is nothing new. I think this is great and totally makes sense to do.
Best link I could find:
http://battlelog.battlefield.com/bf4/forum/threadview/2955064769593908643/
Actual review: http://www.polygon.com/2013/10/29/5040656/battlefield-4-review
Platinums: Red Dead Redemption, Killzone 2, LittleBigPlanet, Terminator Salvation, Uncharted 1, inFamous Second Son, Rocket League