JD,
If I'm not mistaken (which I frequently am, by the way), Q&A threads with Devs have taken place here on OS in the past. Not to say that's any guarantee that it will take place again, however.
Regardless, Nemesis04; and the other CES invitees, go in to painstaking detail once their time with the game and Dev team is over. Do a search for it, specifically Nemesis' thread from last year. It's astounding the things he was able to write about (as well as the others). I'd expect nothing short of the same from these guys this year, taking all of their remarkable character traits into consideration. Yeah, I'll be on these boards for hours on end. Mark my words. Great stuff!
That said, Russell_SCEA answers questions all over this board. I see you're not new here, but just incase you don't navigate the site too frequently, do a member search for his name once you believe he's taking part in MLB 12 Q&A. Also, other Devs such as Woodweaver and ESPECIALLY Brian_SCEA - if you want to have your mind blown - answer a treasure trove's worth of information pre-release and are worth looking up. It makes finding their posts much easier, especially if you chose to have the individual posts themselves show up in your results.