The tram tour isn't that long and not worth waiting more than for the tram to come back and load. Ratatouille is great but will be open here soon enough, plus I think they cancelled or really shortened the last refurb so I wouldn't count on it being open. I do want to go back once it's all been redone, hopefully they'll do a good job and there aren't a lot of cuts. DLP is so fantastic and was done so well themeing wise, especially fantasyland, that studios needs to better match it
ETA - If you had said you wanted to go there to ride big thunder mountain I would say go as soon as you can. Aside from just wanting to visit an international park, riding BTM is a great reason to go. I would go back tomorrow if I could solely to ride it, well maybe not since it's cold and there's been snow, but you know what I mean