Fallout's birthday is a bit hard to peg. Wikipedia says 30 September but this doesn't seem to be based on anything. According to the original website, the "silver" date is 1 October, and it was in stores in North America by 7 October, so take either one as the anniversary date. Nothing new for its 15th, just a good waypoint to commemorate. Go back to check out the 10th anniversary releases if you never have before.