Kernel 5.3-rc1 is available from the Ubuntu mainline PPA or kernel.org.

I am completing some tests on 5.2 before trying 5.3-rc1.

We have a running thread during each mainline kernel release cycle.

Previous cycle threads:
5.2
5.1
5.0
4.20
4.19 ?
4.18
4.17
4.16
4.15
4.14