I'm in the same boat. I'm guessing they'll do like they did with the 2nd beta and add a special "early access service" to your SE account for early access until you get a key with the purchased copy of the game. I'd imagine that service would give you full access in the interim. That leaves two questions for me:

- How long would that early access last? For example, if the game doesn't show up on Monday like it is scheduled to by Amazon, how long before I can't sign in without adding a purchased key?
- When I get a disc and insert it, is it going to try and install another copy of the game (in addition to the one downloaded for beta 2/early access)? Do I suddenly have to insert a disc each time I want to play, even though it has worked fine without one up to this point?