Well, don't take my word for it because I'm a Professor. I don't work at PUI, I don't know any more than the rest of you.
I'm just saying it would be incredibly person for them to rotate just one DP set, and it wouldn't fit with what they've done the last two years.
They typically rotate four sets per year. Two years ago, they only rotated three (for various reasons). Last year, they rotated five to catch up, leaving the last four EX sets and DP. This year, they rotate the normal four and we're left with DP-on.
It's not that I know what's going on, it's just that it's the only thing that makes any sense. Of course, PUI does a lot of stuff that makes no sense, so they could still surprise me.