At this point in beta development, it is unclear in which age the player will begin when they start Uru Live. We were told that it would not be in the cleft (see the Josh Staub town hall notes
), "but it will be very familiar".
Personally, I hope it will be in Tomahna. But realistically, I think it will be in an age that they already have a real-time model for, such as the Volcano interior - they can just borrow it from Myst V.
Where do you think we will start?
Can we rebuild it? Yes, we can.