Demonstration videos... sure, someday... Got a lot of nuts and bolts work to do before that becomes relevant though.
Re: T3D main line, yes and no. The project itself, no, because it is going to involve a lot of logic and dependencies that go far beyond Torque's general purpose game engine mission. However, my intent as I go is to make as many subcomponents as possible be PRed back to the main line, ie things like my animation tools, etc.
In addition, I'm trying to separate out useful lines of work that are still too specific to include in the main engine into their own repos to be shared separately on github (for instance, any physics work I do that doesn't make it into the engine) so that people could make use of it without fully adopting OpenSimEarth.
But anyway, still fixing the terrain pager at the moment, and many other little things to do after that...