Walt Disney Imagineering is currently working on all new costumes for Epcot's World Showcase pavilions. According to sources familiar with the situation, new costumes will be introduced first at the American Adventure and Mexico, with more to follow.
Guest feedback has reportedly been indicating for some time that World Showcase is viewed as somewhat dated, with the costumes being identified as one of the biggest issues. Imagineering is therefore moving to make World Showcase a more current version of the "world", and not a historic, museum-like recreation.