They've been working on parts of I-75 since my first trip in June of '08. On my most recent trip May 19-23, there was paving work going south of 285 for about 2 miles. That was on a Saturday, coming back on Wednesday I saw no work being done in that area. There are still several other Work Zones both directions starting at Macon, speed drops to 60 or 55.
There was also a work zone along the Gainsville stretch in Florida.
Check the Web for the Dept. of Transportation for Georgia, it should provide good details.