I am running Stage 4+ in a 2012 SHO. If I launch from an idle with the traction control on, it goes crazy. With TC off, it does fine even launching at 2200.
The new Xv1 will be for all years, 91 and 93 octanes. For the 13-14s it will carry the boost out. For the 10-14s, it will add more boost utilizing the 3 Bar sensor. The motor will also run a little cooler with the new T Stat and tuned control of the fans. That's about all I know at this point.