I think it was about promoting the PS4, but I think it was also about Square showing strong alongside next-gen in general, with the XBO announcement too, as shareholders were probably beginning to lose faith.
I voted that they might show last year's trailer, but without the FFVersus logo turning into the XV logo... or with the new bits they showed in that Taiwan Expo thing. I don't think there will be anything all new. For better or for worse!!