I also did some investigation on leadwerks engine. What i understood is that they have a new World Editor called Sandbox which ships with the software, so i do not know if the 3d World editor is still necessary.
Video on YouTube I saw that video. It looks enticing. It's a bit different from 3D World Editor and I doubt it makes it obsolete.
Leadwerks still has some quirks and not all of its features are implemented, but so far it is very powerful and has come a tremendous distance and such a short period of time.
By the time I get the appropriate hardware and the cash for the engine I believe it will be further along.
Another thing I like about it is your options of coding language, it gives the coder the ability to use the language they are most comfortable with (as far as I know).
