Thing is, in some ways they have way less to talk about. Sony has actually revealed their specs, their gaming-specific features, etc.
The X-Bone reveal focused so heavily on non-gaming features, it took until today for us to even know what it would mean for gaming. And I say "until today" tongue-in-cheek, of course, since they didn't actually address anything they needed to address...
But Sony has shown games before now, they've released the specs, they've talked about features.
If they're smart, they'll announce gamer-friendly systems in opposition to the X-Bone. If they don't have any, they'll keep silent and still win out that battle while they have internal conversations about it.
Otherwise, all that's really expected is info about PSN/Store, the Vita, and games.
It'll be close, but Romney has the momentum.