At this point, who knows. I assume there is a second land coming at some point, but no idea of when, what, or if it will be any more or less than what was initially proposed. Lion King as a theme still seems like an odd idea for a land to me considering the film is set in a world without any signs or structures, but maybe they'll just ignore that.
At any rate, I find it difficult to be happy that they saved money on the Frozen area based on the idea that money will be spent elsewhere on the park as none of the plans so far reflect that happening. It also leaves the new land exceptionally light on attractions.
As a guest, if the choice is between a visually appealing but underwhelming coaster or nothing, I would take the the former.