It's worth keeping in mind that CD Projekt is a games distributor for Eastern Europe along with digital games through GOG so they'd presumably be there even if they didn't have any projects to show off.
Yup. I don't expect Cyberpunk 2077 to be there yet. They've stated that 2016 will still be a "year of the Witcher" and that they probably won't talk about Cyberpunk until 2017.
They're probably going to hype the shit out of Blood & Wine though.