Rayzoon has announced that Jamstix 2, “The World’s Most Advanced Virtual Drummer VSTi” according to the company, will be released on 8/20/2007.
Features:

Real-time groove composition using dedicated style and drummer modeling (not static patterns!)
In-depth drummer limb simulation, including triangulation of hand movements, ensures that the grooves are always humanly playable (no ten-armed drummer here)
Advanced feel [...]