The 381 HP powerkit is coming for MY 2006.
It will be available for the 997 Carrera S, Carrera S Cabriolet, Carrera 4S and Carrera 4S Cabriolet (yes, you heard it right, 997 Carrera 4S Cabriolet).
Cost in Germany: around 12000 Euro incl. 16% tax.
The PSE seems to be part of the powerkit but I don't have a 100% confirmation for that.
We don't know yet if a retrofit kit will be available.