Now, when I say "pretty fucking awesome" you need to take that with a grain of salt, as I'm far too Tron-obsessed to be objective in any way, shape or form. I will say the effects are excellent, the lighting and set design is ludicrously accurate to Tron: Legacy, and the core concept -- which I shan't spoil -- is one that I fully expect Disney to explode in the actual Tron 3 movie, to at least some degree. However, I think we can all agree that the real Tron 3 would probably not star total unknowns, and Disney probably has enough Tron projects going on already that it's more like this is a fan trailer, and not some new official Tron thing.
That said, if you think I'm not still masturbating furiously to what happens at 4:33, you are wrong. So, so wrong. Infinite thanks to Alice R. for the tip.