New Portal 2 clip demonstrates 'panels'

Aperture Laboratories, by way of Electronic Arts, has released a video showcasing the robotic panels that make up the test chambers in Portal 2.

It seems that "the planks of tomorrow," as they're described in the clip, will both help and hinder the test subjects as they attempt to negotiate the Aperture test chambers. The video is pre-rendered (so there's no gameplay footage in there), but it gives you an indication of some of the puzzles you can expect to encounter when Portal 2 drops on April 21st for PlayStation 3, Xbox 360, Mac and PC.