Well, on the back of my posts and some others, it definitely is interesting that Sony waited until MS revealed pretty much everything except pricing.
There is also a big question here: Announcing something so close to MS would suggest that indeed they are pretty confident that they have something that can at least match what their biggest competitor is doing - or perhaps they're confident that they can undercut them on price? Who knows.
If they weren't this confident, then they could easily have used a little break, allow people to think of something else, and come out at a later stage.
Exciting times!
I just want to see some of their big games running with RT and features we can expect from next gen.