The Yankees have activated both Brett Gardner and David Aardsma off the 60-day DL. Although Gardner has been taking batting practice and whatnot, I assume he will be limited to pinch-running and late-game defense duties from here on out. Aardsma is unlikely to see any meaningful innings.
To clear spots on the 40-man roster, both Steve Pearce and Justin Thomas were designated for assignment. Casey McGehee can hit lefties just as well (probably better, actually) as Pearce, but he offers more versatility and big league/pennant race experience. That last part probably doesn’t matter much. I thought the Yankees would keep Thomas as the third lefty for the final week of the season, but I guess Cory Wade built up enough good will last year and earlier this season to keep his job.