The LA Times travel blog has details on the upcoming “Celebrate! A Street Party” calvacade that will be showing up at Disneyland in late March. There’s also some concept art that gives you an idea of what to expect.
In Florida, the “Move It! Shake It! Celebrate It!” party will be more of a parade, on the same scale as the family fun day parade, but the same general concept as Disneyland’s version. I’ve seen some concept art and it looks similar to the one the LA Times has. It opens in February in the Magic Kingdom