Sony has been slightly quiet on the whole backwards compatibility though. They've said the 100 "most popular" games will work but they've stopped short of actually committing to backwards compatibility for specific games or hardware like psvr.
What makes me laugh is talking to people who've bought the latest Samsung/Apple phone and I ask them whether it's worth the money. To which they always reply
"I'd never spend £1000 on a phone this one's only £80 a month (2 year contract)"
I'm sure Microsoft and Sony will switch to contact deals in the near future as most people seem incapable of working out simple arithmetic!
Sony have said they are testing around 4000 PS4 games, and most should work on PS5, the 100 quote was the initial testing of the 100 most played PS4 games. They have said the PSVR will work, not sure what the camera situation will be though.