The original plans show the Frothy building coming down, but they are pretty clear that none of that is final, and it sounds like the eventual reality would lead to these being bargained away.
I think some individuals seem to think there could be a 20-story building or some sort of multi-use facility there. It's true that Mint St is a bit of a traffic issue, and one of the few things that NCDOT has done here is studied that the train facility would not lead to much more additional traffic (how could it, there wouldn't be that many people working there).
People did get very excited when they talked about putting a building *over* the train facility, kind of like Ogilvie station in Chicago.