I floated a Freeman for Meadows, Bell and Willy Garcia trade about two months ago, then again about two weeks ago. Braves might could take Morse back ($8M 2016) to clear some payroll for the Pirates and send them CB along with Freeman for appearances sake.
I think it makes perfect sense for both sides. The Pirates need to win now since after McCutchen and his $14.5M club option are finished after the 2018 season, he is gone. They are clearing cash with the retirement and departure of several fairly expensive pieces from 2015 like AJ Burnett, Aramis Ramirez (1/2 season), Joe Blanton, etc. They also conceivably clear more money after 2016 and 2017 in Liriano, Locke, Morton, etc. so Glasnow is likely much more important to them short and long term than Meadows given that they have Marte, McCutchen and Polanco all lined up in the outfield through AT LEAST 2018.
For the Braves, it brings back a top LH CF/LF (#22 overall), the #1 rated SW 1B prospect in baseball (#31 overall), and a RH RF prospect who is probably better than any of prospect the Braves have right now with the possible exception of Davidson. Getting Morse in the return would be icing on the cake for the Braves because they could live with him or without him in the deal AND you clear Freemans $12M this year and $20+M per year moving forward.