I made a hotel-only reservation at RP today and the agent went through the "script" of what the hotel is like and what's included. As part of her script, she said that all on-site guests will have 1 hr early access into the park and, in addition, will receive 1 express pass/per person/per day that can be used in WWoHP. She went on to list the rides that would be open during that 1 hr.
I asked her explain the one hour/express pass benefit and she said "for example, you can get into the park 1 hr early and ride what you can and later, when the park is open to the general public, you could use your express pass to ride the Forbidden Journey again". I told her that I was there last year just as RRR was opening and the park didn't open early, nor were there any express passes. She commented that a decision was definitely made to change that for WWoHP because it is just going to be so popular.
I suppose we'll all know for certain once someone gets onsite, but I have to say, this added benefit rolled right off this agent's tongue as part of the normal hotel description, features of the hotel, benefits of staying onsite, etc, script.