Wayland/Weston 1.5 is set to introduce support for the new XWayland DDX, full-screen shell protocol support, libinput support, and many other changes that landed over the past quarter.
While there's many changes to Wayland 1.5, it doesn't look like there should be much fallout from the many new features. When releasing the Wayland 1.5 RC, Kristian Høgsberg mentioned they're at "a historic low in terms of open bug" with just 15 open bugs covering Wayland/Weston. The overall state of Wayland appears to be very good.
More good news about Wayland 1.5 is that it's passing all of Intel's automated test-cases. Ullysses Artie Eoff at Intel shared their automated test pass rate was at 100%. In terms of their manual test pass rate, it was at 84%, which is a +15% improvement over the Wayland 1.5 Alpha. Those wishing to find out more about the Wayland 1.5 release candidate results can find the information shared on the Wayland-devel list. Wayland 1.5 with Weston 1.5 should be officially released in the next few days.