Another variable that is coming into play is Aulani's change in point seasons that occurs in the latter half of June. May 6 to June 23, 2013 is part of the Choice season. June 24, 2013, is the start of the Magic season. For a 7 night stay, an Ocean View one-bedroom villa's cost jumps from 350 points to 406 points from the Choice season to the Magic season.
I suspect a lot of members are trying to squeeze into the cheaper Choice season to save points. This past June, my sister booked a one-bedroom for June 15-21, 2012, right when the 7 month window opened. She was told by MS that she was getting the last Ocean View one-bedroom available at that time.
Combine the change in point seasons with the fact that school terms are ending in late May and early June, as well as the start of the summer vacation season, and the result should be heavy demand for Aulani in early to mid June.