The Star Wars hotel will be different from a hotel room. It is being described as a "2-day experience". More than likely it will not be a nightly rate, but a per person "package" rate. I believe there were some Disney polls put out before the announcement (or shortly after) where they were asking about an $800 per person price point for the 2-day experience - but I've sort of always though they might target higher than that.
I expect it to be fairly "boutique" and would be quite surprised if it exceeds 300 rooms.
As LOL said, it's complete speculation right now. The only thing we can be certain of - it won't be cheap.