Just offering my humble contribution, but I got to see the amazing Happiness is Here parade yesterday and posted photos:
PHOTOS: 'Happiness Is Here' Parade from Tokyo Disneyland - Disney News by StitchKingdom.com
Also, this is probably no shocker but was to me. The limited edition stuff is available to annual passholders and funderful disney members only, at least the Mickey figure is. they also told me he's made to order.
Out of the items I found yesterday, one of the most popular appears to be the special edition Coca-Cola bottle. I believe it's 800 yen.
Also, the magic shop (which has tons of Disney-themed magic items -- something the US doesn't have), has several items branded for the anniversary, not available anywhere else (that I've seen).