There is good news on the alternate-uniforms front in MLB 13: The Show to report. According to PastaPadre.com, the game will feature throwback uniforms.
PastaPadre.com offered the following details:
The company also noted that each team in MLB 13 will have two throwback options to wear and over 30 of them will be new to the series. Throwbacks that have been singled out include the 1908 Red Sox and 1934 Reds.
Check out this gallery of screenshots of the throwbacks: