Big Show being the first announced entrant is the only confirmed plan for the 2016 WWE Royal Rumble right now
Dean Ambrose versus Kevin Owens is looking likely since it’s been getting a serious build lately, but nothing else is confirmed. As far as Big Show’s entry number, there was some initial confusion, but it was previously reported that WWE did confirm Show is just in the Rumble match itself; not the #1 entry like it was speculated.