There will absolutely be NO trailer parks or cabins and there will probably not be hotels, either. This is going to essentially be the Villages by Disney, so expect the same concept and an even higher construction standard: for every 1000 or so residential units, there will be a central "market" area where a supermarket, restaurants and some services like medical offices, dry cleaners will be located, along some recreational areas, surrounded by single-family homes and some "villa" residences (which are semi-detached and sold as condo units for a slightly lower price.) Some homes will have their own small pools, but there will be a community pool with a clubhouse for every 30 units or so. Exercise classes will be held in the clubhouses, along with more sedentary activities like book clubs and card games. As RedArt59 pointed out, owner covenants will be very strict, and HOA fees will be accordingly steep.
Personally, I wouldn't live in a suburban community of this type if you paid me to do so, but many, many retirees just love them. More power to them if I make money on it as a Disney shareholder.
PS: What will be interesting, given that Disney is the developer, is whether they will experiment with some "mixed age adjacent" communities as well. Typically, retirement communities like this ban children from living there and even from visiting for more than a few nights at a time, but there are some new planned communities that have begun to group all-age developments adjacent to retirement communities, so that it is convenient for adult kids to easily check on Mom & Dad, and the grandkids can go hang out for a while after school.
PPS: To the overseas poster who asked if the corporation builds a couple of homes? Not hardly. Developments like this are typically very large and contain thousands of homes. The Villages, which is less than 100 miles from WDW and is the most successful community of this type, currently has about 60,000 single-family homes and semi-detached villas, with more continuously under construction. It is spread out over 3 counties. (Notably, there is no dedicated public transportation there for residents, though there is one public bus route on the Sumter County side, which I understand is mostly used by daily caregivers); Villages residents drive everywhere, often via golf cart.) This is an aerial photo of a typical section of the Villages: