We have yet to do the HDDR but did a dinner show at Disneyland in 2013 that seems very similar from what I can tell. Is the Disneyland show indeed similar to HDDR?
The shop online link on the Disney World site no longer goes to shop Disney parks site, it now links to the shop Disney site on the parks tab. Looks like they are starting to combine these two.
Doubt they have plans for a music streaming service. They don't have nearly enough content to compete in that field, so better to just take Amazon's money. And if they do have plans, hopefully they learned from the exclusivity deal they have with TNT.