"[The expansion] may be in downloadable form via PSN, or as a standalone retail disc, or both. I can't say definitively yet that it will happen, and I definitely can't say when. But it's looking good, and hopefully we'll have good news soon."
A downloadable expansion will guarantee that PS3 owners won't be missing out on any of the content delivered to Xbox 360 owners. Hey, Bethesda -- all of us have hard drives and free access to the PSN. Let's get it rolling!