Here is an impressive trailer for SIGGRAPH 2014, featuring some gorgeous CG animation.
ZBrush SIGGRAPH 2013 Recap
Here is a massive recap of ZBrush's presentations from Siggraph 2013.
ZBrush at SIGGRAPH 2013
Check out what Pixologic's has in store for you with their ZBrush booth at SIGGRAPH 2013.