I'm pretty sure this means it will be available for Xbone and PC. The port is complete, it's just that these events get publicity through creating partnerships with developers to showcase their content.
He had mention transferring Xbox 360 too, so that implies it can be upgraded to the Xbone as well. I'm ok in this arena because I play on PS3. With that said, I really don't see why this wouldn't be the final product that could be played on PC. We need an official statement from Rockstar now on all the details.