Because I'm really digging the subtly different look of the Pathfinder logo on the Campaign Setting books recently. The color scheme is more pleasant, the texturing is wonderful, and it just has a nicer feel to it in general.
If this has already been discussed (or this is the wrong forum to discuss it) I apologize. I did a search on the messageboards and didn't see any threads about it, and I thought it was nice enough to be pointed out and applauded. It's a very nice little improvement.