This needs an answer.
Is patch 2.0 deployed on the 9th but only eligible players have acces to Makeb and related content?
Or do you only get the patch 2.0 changes when you have access to the new expansion?
Same question reworded for clarity. What happens to players on the 9th who don't have early access?
The answer is all the patch 2.0 changes will go live. Things that you do have access to without RotHC like new talent trees will be available to you. However, Makeb and all it's features like getting to 55 will not be accessible until you purchase RotHC and wait for it's launch on the 14th.
Hope this helps clarify it for you.