The Yankees signed Carlos Beltran about two weeks ago and it had yet to be official. The hold up could be any number of things, but it is likely because they needed to figure out who they were going to DFA to make room for him on the roster. Beltran's three-year, $45 million deal has officially been announced on Thursday, in time for his introductory press conference on Friday, and Brett Marshall has been designated for assignment to open up a spot on the 40-man roster.
Just 23, Marshall made his major league debut in 2013, pitching 12 innings across three games while managing a 4.50 ERA. In his first career start against the Mariners on May 15, he surrendered five earned runs on nine hits and gave up five walks in 5.2 innings. In Triple-A he had a 3.52 ERA and 4.09 FIP in 138.2 innings, and a total of 437.1 innings over the last three seasons. While he's always been a mediocre innings eater, and that has some value, he was easy to cut now that they have David Phelps, Adam Warren, Vidal Nuno, and Shane Greene on the 40-man roster. All have more impressive recent track records, so he wasn't really worth keeping when a move needed to be made.
It's possible the Yankees could try to re-sign him, though another team is more than likely willing to give him a roster spot, at least through spring training, to see if he can be useful on their team. He could serve as someone else's Adam Warren, though that in itself is probably why the Yankees didn't want to keep him.
With Matt Thornton and Brian Roberts still needing roster spots, expect at least two more moves to happen soon.