It's not nearly as exciting as inking Tanaka, but the Yankees did sign a pair of pitchers to MiL contracts yesterday. Via Matt Eddy, 28-year-old Bruce Billings and 38-year-old Yoshinori Tateyama both received deals, although it's not known if either received an invitation to ST.
Regardless of whether they did or not, neither of these guys should factor into the Major League plans at all in 2014. They have a combined 68.0 Major League IP in their careers, none since 2012. Billings has spent the last 3 years as an innings eater starter and spot reliever in the Oakland A's system and Tateyama was a long man for the SWB RailRiders last year, posting a 1.70/2.18 split in 42.0 IP.
These 2 should provide depth for the Triple-A pitching staff and allow the Yanks to call up younger pitchers like Mark Montgomery, Chase Whitley, and Dellin Betances if and when they're services are needed. You can never have too much pitching, and that rule still applies when it comes to MiL depth.