Many years ago I was told by a friend within Disney, that if they were to ever touch Tomorrowland, in a way that would revamp and update it. The entire land except Space would be bulldozed and the prjoect would be revealed section by section in phases over the space of a few years. This was around 2015.
I would not assume anything has been green-lit. But it seems like that is the current idea if they were to UPDATE tomorrow-land, instead of bringing in a new IP.