The price is under NDA but I can say that there is separate, special devkit hardware for PS4 and it costs more than a consumer unit.
> You can launch your app on a device using a free Apple ID account, but the capabilities available to your app depends on the platform and your Apple Developer Program membership, described in Supported Capabilities.
You just won't have access to CloudKit, Game Center, Push Notifications, Wallet, In-App Purchases, etc.
[0]: https://developer.apple.com/library/content/documentation/ID...