MLB.com’s At Bat application for mobile devices is getting an Opening Day update today.

There are a number of improvements to the iPad, iPhone and Android versions of the app, and include added functionality and new features.

Some of the biggest features are free MLB.tv access for the month of April, sponsored by Volvo, allowing users to watch any out-of-market MLB game on their device live.

Key plays and pivotal moments, as well as live look-ins to games, all blackout-free.

Archives games, letting users see any 2011 game on-demand.

In addition, the iPad app gets a redesigned Gameday pitch-by-pitch look, with images of every ballpark now used for the screen instead of a generic stadium. The images are from the video game MLB ’11 The Show

On the iPhone and Android apps, check-in functionality with venue information has been added to the app, giving users bonus features when they check-in at the ballpark.

More information in MLB.com’s press release, after the jump.

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