Has to be. The only real park perk to staying there will be early entry, so it will probably be full when Potter opens for that reason alone.
But they said in 2014 the hotel will be open. I think Potter opens in 2015, but you know what, 2014 might be the year.
Also, I think they need to add something to replace the water taxi, not express pass. Maybe extra park hour, because the more hotels with early admission, the less of a perk it becomes.