It would be great for them to announce something for DAK - the last thing we got was Pandora, and if we take things in 'turns' then DAK is next in line. This is compounded by the fact that the other three parks are all getting something major and we it wouldn't be good if DAK were the only one left untouched for the 50th in any major way.
Now what might this be? Well, it's hard to say. The clues we have is that is a good fit (that is, the OP's opinion) in the same fashion that Pandora is, but it might also upset a few 'purists' in the same way Pandora did as well. It says a ride so I will assume it is such and not an entire land.
It probably isn't the Excavator because that would upset no one (or at least not it in its original state), and obviously it will be an IP. Although apparently there is a non-IP option that isn't at the forefront currently.
Asia has two rides, Africa has a ride and a show; I would prefer a ride to go to Africa even though its combined line up is still currently stronger, being that FotLK is better than Kali. However Dinoland and Pandora tp me seem as if they may be the most likely options. Pandora expansion is marketable and honestly necessary given how underwhelming the dark ride is, and Dinoland is obvious in that it needs to totally change. Maybe something there, or maybe a replacement.
I think it will be either a Pandora Expansion or a Dinoland redo/revamp (to whichever degree might that be taken to), as much as I'd personally like temperate or marine environments represented given that now we only have the tropical savannahs, rainforests, and briefly wetlands.