Is R2-D2 in it?
Is the adventure set at a certain era/date?
I can't see anything explicit, unless it's buried somewhere deep. I imagine those more familiar with FR would be able to deduce that from context.
There’s no terms, but I’m just answering questions for now.
We've been told that the adventure will change based on the season you set it in. Just how big a difference does that seem to make?
Each season means a different main villain.
Any villain pop out as an early favorite?
Xanathar, I think. I guess a beholder villain feels the most fun to me. He's the villain if you choose Spring as your season.