I happened to wander downstairs early this morning and saw the "news" about Anna & Elsa officially moving to PFTH. If, like me, you are in your FP+ "window" and want to reserve one for this meet-and-greet, do some "clicking around" if they don't show up at first on MME. I'm sure others' experiences may differ, but I found that they were only listed as FP+ options during limited hours on weekdays -- they weren't offered at all Friday-Sunday, but I was offered my choice of times (between 9am and 4pm) on a random Monday or Tuesday.
Also, strangely enough, none of the other princesses at PFTH were listed as FP+ options at any time, for any day of my trip (5/4-5/10). Perhaps WDW is still deciding who stays and who goes...
Also, strangely enough, none of the other princesses at PFTH were listed as FP+ options at any time, for any day of my trip (5/4-5/10). Perhaps WDW is still deciding who stays and who goes...