I am a little concerned about this since it was not mentioned at all on the fact sheet (on the PlayStation site). I know that in the scope of things it's not that big of a deal, but with all the attention that casual gaming seems to be getting these days this mode would seem like a no-brainer. HR Derby would certainly appeal to the non-hardcore baseball fans that just want to take some swings for the seats. I am still hoping that they are waiting to announce this as part of a bigger "All-Star Events Package" or perhaps even some sort of integration with Home.
*fingers crossed for 3rd year in a row*