I am having a Swan wedding in December, so I can add to this a bit:
-You can absolutely have a DP. I'm having an Illuminations DP in Epcot (French Lower Terrace!

) & I am getting the same exact package that DFTB have. I booked through Disney Event Planning. We told them it was a holiday gathering when we booked (which it sorta is as well). I cannot wear my wedding dress because we are entering through the international gateway, but I'm OK with that, since we booked our DP the night before our wedding!

We are also having a welcome dinner at 1900 Park Fare.
-I am also having Mickey & Minnie at our reception. You actually go through Disney to book this, but my Just Marry planner got me in touch with them. Same exact service as through DFTW, so I'm guessing the same rules apply. I did know a Swan bride who had pictures of Mickey & Minnie outside at Crescent Terrace for the cake cutting. They may also go to the beach, but I"m not sure. Mickey & Minnie will be inside at our reception
-We are having an actual reception in one of the Swan ballrooms. I'm so excited with the room & the linens & stuff! Swan catering is also award winning. We got to sample it during our planning session (which was free). We are also having a cocktail hour in the Swan Courtyard.
-We chose the officiant we wanted. It is actually an officiant that DFTW uses as well. We will have Randy Chapman for photography, Beaute Special for hair & make up. Even our DJ is a DJ that DFTW uses. The Swan has access to all the same vendors except for floral. Our floral is from Greenery Productions & we got to meet with the florist personally to coordinate our flowers & linens.
-Best of all, our planner Karen is AMAZING!!! She is so knowledgeable, organized, and she emails you back within minutes all the time! She makes you feel very relaxed and taken care of & just seems like she genuinely loves what she does for a living

She will talk to you on the phone, meet with you in person, whatever anytime you want (no additional charge or time limit). My parents met her & our catering coordinator one day & they also gave her a tour of the ceremony site & reception room.
Really the only thing you lose out on having a Swan wedding is the MK photoshoot, but you can have a photoshoot in any of the other parks. I would have loved the MK photoshoot, but honestly, I feel like I am having a DFTW for half the price, so to me it was worth the loss.
The best thing about the Swan wedding is the flexibility. We went from 25 guests to 60 guests & that was no problem with the Swan. No increase in price, except for the price of the additional plated lunches & we had to upgrade our cake to accommodate the crowd. You can customize anything.