I expect that they'll do what they do at every conference: show video of a celebrity wearing and reacting to the product.
I think you'll be surprised if that's really what you expect. Developers don't pay money to see something like that. They're there to learn and the three presentations are aimed at using the platform. Expect an SDK release as well.
It's GDC, not MLC. I doubt many people decided to attend the conference solely due to Magic Leap's presence.
Er, I didn't say that. But the three presentations are to teach devs how to use their platform. I'm sure you were just being snarky with the assumption that it will just be another celebrity appearance, but I'm pointing out that there is about to be a windfall of info about their device, it's capabilities and real world demos.