- You've activated the Full game but it hasn't be relseaed yet to Steam still has you on BETA Accsess.
- At midnight 7th November (give or take 30 minutes), SI will release and once the Steam serves are ready to deliver the updates, the full version will be available.
Steam is usually good for delivering on time. That's how they command their prices; they're pretty much guaranteed to never give you a problem and give you the game quickly and promptly.
If you bought the game from a 3rd party website, you'll have to wait until you get your Game-KEY.