Why would they reveal PC version of their (ex-)exclusives in their own event?
I mean, most of their fans will be watching it, right. There'll be lots of disappointments and that'll be the last thing they want to do.
They won't say it, but you can take some educated guesses from how they word things - although that has changed since E3 this year, where sony referred to everything simply as exclusive, yet later it turned out once again that the majority is timed. Also even the ones that are full on exclusive from third parties get a turn around sometimes. Hard to work out as easily these days, but the press releases later make things a bit more clear