I asked about wheelchair access to both rides for myself (FoP) as well as someone who uses wheels (Navi) prior to my trip. I received a v/m about it and then read more after the fact. So far neither have them and those were asked to transfer. Maybe they will add but like many slow moving rides sit does require transfer at this time.
As an FYI Disability Services is a great group to talk with. You can use the contact form
https://disneyworld.disney.go.com/help/email/ (and choose Disability Services) or call them (407) 560-2547. I've had to be in contact with them more than once about issues.
Unlike the other poster I have not heard of them adding a boat but who knows. One I travel with has difficulty with boats and only does ones like IASW or Jungle Cruise since you can remain in a chair.