There will also be two original documentaries, including 14 Back (a look at a pivotal 1978 AL East game between the Red Sox and Yankees).

This won't make you ditch your MLB.TV subscription, or ESPN for that matter. Not that the SI TV team is really aiming for that -- they're clearly treating the $5 per month offering more as a complement to whatever sports coverage you already have. The MLB deal just makes that supplement more compelling.