Yes. The headset will be compatible due to the fact that you can connect it to one of the two USB ports on the PS4.
Yes it is compatible with any USB.
It is not compatible with USB 1.1 but it is compatible with USB 2.0 and mostly it matters on what motherboard you have. With USB 2.0 is a USB 3.0 port, the speeds will be the same but if it is a USB 3.0 in a USB 3.0 port, the speeds will be increased to about 4.8 - 5 Gbps compared to 480 Mbps.
USB 3.0 Extensions are backward compatible. USB 3.0 Device cables are not.
No what I believe
Yes, virtually all major brand USB adapters are compatible with Macintosh computers.
External tape drives will not be compatible with the upcoming USB 3.0 specification, however USB 3.0 will be backwards compatible with it.
A laptop which can be used with something, i.e: A laptop with a usb port is compatible with a usb stick. A laptop with Win XP is not compatible with MAC OSX programs. A laptop with a Graphics Card is compatible with the appropriate driver. I really could go on.
backward compatible
No!
the drivers should be compatible
Denon turntables are compatible with all PC's right now.