The teasing has begun!
I bet its not even a ride. Might be a dinosaur themed area of some sort. If thats the case, then they would have foreshadowed it with the front entrance for the HG because they had a truck with a Jurassic Park like LC logo on it with the blue wooden fence pieces around it.
Theres always the Jr. Woodie possibility too but that seems unlikely. But that wooden warrior pic on LC's page with LakeC in the file name is also interesting. They also said the addition will be special, create buzz, be exciting, and now major.
From what I have heard it is not a ride, but I don't know what it would be.