Is this hotel going to have water taxis and an entrance into VB?
While the hotel will not have a dedicated water taxi, you can easily walk over to the Sapphire Falls dock and use that one. We did this a few times while staying at Cabana Bay, so it should still be available for non Sapphire Falls guests once Aventura opens.
I don't believe there have been any official announcements about a private walkway to VB, but some bioreconstruct aerial updates show a path that could be this private walkway as seen here with the red arrow:
Arrow credit goes to @Joel earlier in this thread.