On February 4, 2014 Rosetta will replace Periwinkle at Tinker Bell’s Magical Nook in Adventureland in the Magic Kingdom. Periwinkle will not return for meet and greets after the switch.
In the long term, the Magic Kingdom is still planning to move Tinker Bell to Town Square Theater, but they are still working on the interior of the building to make it appropriate for Tinker Bell. Once Tink moves into Town Square Theater, she will be the only pixie at the meet and greet and the temporary kiosk for Fastpass+ will be relocated elsewhere.
No date has been announced at this time for the relocation.
I’ve already updated the Character Locator app to reflect this change.