I think they've got their two big hotels, Disneyland Hotel and Grand Californian, to handle that
resort/water slide demographic. They have plenty of room for two, maybe three, large new hotels on current land used by surface parking lots off Katella and/or Disneyland Drive. A few moments looking at Google Earth shows all of the sprawling surface parking lots still existing on Disney property in Anaheim, in addition to repurposing existing Disney owned hotels.
The transportation hub isn't neccesary, as it will be located at the ARTIC site a mile east down Katella. That's where the current Surfliner/Metrolink train station is, and where the southern terminus of California High Speed Rail will be located in a sprawling multi-modal facility handling High Speed Rail, Surfliner, Metrolink, and Anaheim Fixed Guideway trains.
ARTIC is
HUGE and arrives about a year after Cars Land opens, with the first High Speed Rail trains arriving a few years later.
http://www.octa.net/M2Project.aspx?EntryId=343&TabId=1331
Disneyland Resort's role is just a stop or two on the Fixed Guideway route to and from ARTIC, so there is no need for any major "transportation hub" aside from what already exists or whay may be expanded at existing facilities in the future.
Can we put the water park idea to bed now? It's very sleepy. :lol: