Woo, I am so going to buy this :O The graphics and gameplay of 2009 was amazing so 2010 has got to be even better!

Here is the news story:
Thanks to the ESPN preview for MLB 10: The Show the cover athlete has been confirmed as Minnesota Twins catcher Joe Mauer. Speculation had him as one of the most likely candidates and was determined to be the top possibility in the prediction article last month. It was also worth noting that the first screenshots released for the game had him prominently displayed in two of the six. The choice of Mauer represents a refreshing move out of the Northeast for cover representatives. Previous years of the SCEA franchise have featured Dustin Pedroia, Ryan Howard, David Wright, and David Ortiz.
Mauer won the AL MVP after a year in which he led baseball with a .365 average with 28 HRs and 96 RBIs while also winning a Gold Glove at catcher. He helped lead the Twins to the playoffs after a comeback in the AL Central resulted in a one-game playoff win over the Tigers. Mauer will get to usher in the brand new stadium Target Field and new uniforms along with his cover appearance this coming year.

Source