I've been playing around with O2 light for a bit, and I really haven't seen much difference. In fact, some things seem to be developed better than my O2, and other options have been added such as Gizmo mapping.
Anyone (cough - BIS - cough) know what the difference between these two versions is?
I have noticed it uses a different method to place and map textures. Haven't figured it all out yet, but having the old O2 I may be set in my ways.
Please post the differences you notice here.