Collision Detection

Camelot Unchained will have collision detection, as very important aspect of combat, encouraging strategical teamplay through use of formations, shieldwalls, bottlenecks, turtling etc. which can be especially important in sieges and against zergs.

The Opposition Podcast with Mark Jacobs
Here (the first post in that thread) is the list of topics, in order in which they appear in the video below - skip to 1:13:15 for collision detection: