Three new rumours have appeared about the PlayStation 5, of which two are verifiable. Apparently, the DualShock 5 will not only have context-adaptive triggers but will also be backwards compatible with the PS4. The DualShock 4 will supposedly be forwards compatible with the PlayStation 5, which would probably make more sense.
https://www.notebookcheck.net/New-DualShock-5-speculation-amid-latest-PlayStation-5-rumours.450629.0.html