[antiuniverse]

With Unity 4, only the Pro version supported the Oculus Rift plugin, because the Rift SDK relies on render-to-texture support, which was disabled in the free version.

Now the free version of Unity also supports the Rift. That is indeed new.

EDIT: I am totally wrong!

[ChrisClark]

Nope, they specifically released a Rift plugin for the Free version of Unity 4 just a few months ago. http://blogs.unity3d.com/2014/12/23/calling-all-vr-enthusias... With full lens correction that needs render-to-texture. Render-to-texture is still disabled in Unity 4 Free, but it is specifically allowed just for the Oculus plugin.

[antiuniverse]

Oh, I stand corrected! Thanks for clarifying.