Official PlayStation ThreadWatch
It's already confirmed to have ray tracing, in the PC version at least.
This so far has been pretty lacking, missed the first few minutes but the only new thing is FF16, other than that it's all stuff we've seen before
All "Xbox exclusive" means these days is "not on PlayStation" so it makes sense that Sony are taking a similar approach. They've already started with Horizon Zero Dawn, soon we could see stuff like Killzone, Uncharted and co on Steam. (this would have seemed mad 5 years ago, but we're in the days of having Halo available on Steam)
It has a reasonable enough explanation - Xbone sales were weak, MS regretted making things exclusives so hurried a lot of games out onto PC, and now Sony is following suit to make sure it doesn't lose out on that market too. Really the only way XB/PS can compete with PC now is pricing very competitively, because they're very quickly losing all selling points.
No, 2 games, already forgotten about the Harry Potter thing