Not sure about MLB though.
Multichannel News speculates that they may have the rights to MLB games from teams that have deals with the Fox RSNs:
The new national sports networks, starting with the 2014 MLB season, also may also be able to televise games involving clubs that Fox's RSNs have rights contracts with it. For instance, an Angels-Detroit Tigers game slated for FS West and FS Detroit could air nationally as Fox holds the regional rights to both teams. Conversely, the deal would not apply to the Boston Red Sox (NESN) and Washington Nationals (MASN).