Just an update:
As you may have heard, DS Town Center (let's call it TC) will be opening 5/15. The new bus loop is now expected to open to Guests around the end of May, after 2 weeks of testing and driver training. Buses will drop off at TC, from whence Guests will be able to walk to one of the 3 other neighborhoods.
The bus pick-ups will be a little bit farther west. If you're lucky enough to be going to a resort that picks up at one of the first 6 load zones, it will be a very short walk. If you have to go to one of the outermost load zones, it will be another 1/4 mi., similar to the MK bus depot. This is just a guess, but I suspect that Pop and AoA will be at the furthest load zones, since they are the ones designed to accommodate articulated buses.
And it's been confirmed that bus service to the existing Marketplace depot will be discontinued.