I do not believe OLC is interested in interconnecting the parks. Its too much of a guest flow nightmare and they really actively discourage park hopping with their ticketing structure. Beyond that it is actually quite a long walk up the entire length of the new beauty and the beast show building and toon town.
On the other hand there will definitely be an alternative entrance for hotel guests. Probably just limited to hotel guests. What's particularly interesting about that is there could be a convincing reason to actually leave the park and take the monorail if you want to rapidly get to the front of the park.
I now think there is a little artistic license in the concept art and there won't be such a huge amount of headspace for Tangled. I actually think it probably falls behind the Arrendale castle - but for artistic reasons it made sense to shift it over a bit so we could 'see' it all.
I think given all of this and the plot they have for Pan we have more evidence that they are reusing the flight of passage tech for pan whereas Frozen will get one mega single floored facility (?Shanghai's Pirates type size).