Wayland 1.10 Alpha features the new drag and drop actions API, frame events group allow grouping pointer events together for features liek diagonal scrolling, a new buffer damage request to let applications communicate about areas of a surface that should be re-rendered, shared memory buffer changes, other new API additions, and other changes.
Details on Wayland 1.10 Alpha via the 1.9.91 announcement.
Weston 1.10 Alpha meanwhile takes advantage of the new Wayland protocol changes, a Video 4 Linux 2 (V4L2) client is now included for demonstration purposes, the IVI (in-vehicle infotainment) shell has improved multi-screen functionality, touch input support now works, new Weston.ini configuration changes, systemd notification support is optional, and other work landed. Details on the Weston compositor changes here.
A beta release is expected in two weeks followed by the Wayland 1.10 RC a week later. Wayland 1.10 and Weston 1.10 are expected to be officially released on 16 February.