We’ve not got to this feature set yet, we’ll be working on all that kind of thing in future sprints, or even milestones.
At the moment, to contain the feature-set, we’ll be working on the basis of there being a single draft site (but with multiple edits/versions). Again, this is to keep the design and implimentation work somewhat contained, and building up from there.
It’s pretty easy to envision how we could accommodate mulitple drafts in future iterations though, so it’s on the radar.