Rick Ruth has released the new numbers. Looks like STX got harder, STS easier, and almost all of Street got softer while GS stayed the same. Very slight drop in HS pax, but the top end cars got a nice break. Makes sense that higher hp cars lose more to street tires. STC is now harder, as they got rolled into the STS pax.
http://home.comcast.net/~paxrtp/rtp2015.html