Fantasy Grounds is a WotC licensee (as are Gale Force 9, WizKids, n-Space, etc.)
Yeah, my bet is that they're filling them in on next year's storylines.
It is held every year. This is just the first year for us. Since many of us are digital partners, it gives us an opportunity to to see what is coming in the future and to prepare for it from each of our platforms. We won't be able to share any secrets, other then to say that there are a number of cool things in the works.
We did have to don black cloaks, recite sections of the PHB backwards and drink dark red fluid from a goblet shaped like a skull, but it didn't really seem weird or anything. I have a five or six hour window of time I can't account for, but I think I was just sleeping.