It's "unofficialy official". The Orange County Register ran a large graphic map of the changes coming to DCA and "MuppetVision" was indicated as "Mickey's Philharmagic" even though Disney made no mention of this in their first presentation. Many other changes were suggested to the entire Park on the map, but these were never addressed either. It makes sence since a single themed attraction (like the bread-baking or tortilla making exhibits for example) come off out of place. The "Hollywood-land" thing might be redesigned as Walt's Hyperion Studios, so a classic Mickey film would make a lot more sence, and "Rizzo's Prop and Pawn Shop" has been gone for years now anyway.
A couple of other notes on posts in this thread. The "orange swing thing" is named "The Orange Stinger" since the insides are bee-themed. It's going bye-bye as well along with the Maliboomer. "California Sceamin'" is rumored to be re-themed as a "Disney Villains" indoor/outdoor coaster similar to Expidition Everest, but since it's one of the few popular attractions in the Park, this was put off for a later phase of the project along with the Grizzly River Run re-devolopment. And while The Hyperion Theater itself is enclosed, the queue area is not exposing guests waiting in an outdoor "holding pen" to the elements. The long-term plan is to enclose (and beautify) this area, add a real lobby and much-needed restrooms and elevators, which Eisner and Pressler cut from the original budget.
Work starts in January on the lagoon show, with the rest to follow within a two-year period. Completion of at least Phase 1 is said to be 2012.