I'm quite sure is the same bitrate and res as last year.
The 2010 season had a lower res.
Frame rate is lower than live TV. Looks like ~24FPS
With the XBMC MLB addon, max you can select is 2400k bitrate. It is higher with with regular devices like the ATV ect. I think it is around 4500 5000k. Was trying to check earlier with an ATV 3 connected by wire on a router with tomato. I got distracted. I saw the graph. It was around 5000k