Is there service to the Dolphin By Magical Express ? Thought I read somewhere that they were going to start including Swan/Dolphin one of these days....
It's doubtful ME will ever service Swan/Dolphin. Disney is trying to encourage guests to stay at a Disney resort (same with the Disney Dining Plan - it is extremely unlikely Swan/Dolphin guests will ever be able to use this plan).
OntFamily is exactly right. Disney's Magical Express is marketing tool to get people to stay at Disney owned-and-operated resorts. Disney has NO REASON to extend DME to non-Disney hotels.
Some of the guests on the land sea package stay in the S/D. DCL uses DME in order to transport guests to/from MCO and WDW. Those guests use DME, I'm not sure about luggage delivery.
S/D guests can pay Mears for transfers, many of those guests are transported in a DME bus.
I don't think Disney would ever extend DME to all S/D guests, I don't know if S/D could pay Disney in order to participate. BAGS is offering the RAC in other hotels, not for free. I'm sure Swan Dolphin could provide that service.