You were on top of it, Flying Pig. Article in the Charlotte Observer this morning. The plan, called the Brooklyn Renaissance Project, calls for a complete overhaul of Charlotte's 2nd ward adding dramatic retail space, 6000 homes (mostly condo's) and the centerpiece, a 38,000 seat stadium with a retractable roof. City board of commissioners called the plan "intriguing, amazing and exciting" Some in the city have said that the Charlotte area is at least 15-20 years from being able to support a major league franchise, and that a smaller minor league stadium makes more sense for right now. MLB consideration could be looked at further down the road. (Go figure, build 2 stadiums)
The minor league stadium being considered would never be able to handle a major league franchise. Personally, I think you strike while the opportunity is available, and depend on the huge growth of the area and the ability to draw from the entire region, but then again, Charlotte has never been known to have much foresight. I-485 was designed as a "two lane" outer connector for two major interstates (85 & 77) that was overcrowded before ever being completed.
Sounds like a long shot, but "youneverknow."