Euclideon (Infinite Detail) Responds to Notch (hardocp.com)

Unfortunately, they do so rather poorly, and they do it as a 40-minute video interview. They also don't provide any useful or meaningful refutations.

Things they have yet to demonstrate:

  Animation in a remotely current version of the engine
  Animation of more particles than comparable technology (Atomontage)
  Dynamic shadows or light sources
  A world composed primarily of non-duplicate objects