My wife and I were on the Allure this past October and we stayed in a Crown Loft Suite. We were given priority boarding because we were in a suite. We boarded the ship at noon and we could not access our suite until 1:00 which was fine it gave us time to have some lunch.
Quantum of the Seas 12/2014
Oasis OTS 6/2015
Serenade OTS 12/2015
It's Royal Caribbean practice to open up staterooms to guests at 1PM; pretty much fleet wide around the world. No special access to the rooms are provided for guests in suites. While mos boarding documentation says you can begin at 2pm; 95% of the cruises I've sailed with them (40+) and you start boarding by 11AM or so (no matter the cabin class).