Weston 2.0 is the next version of this "playground" for Wayland compositor technologies since the new output configuration API had broke the ABI, necessitating a break from the same versioning as Wayland.
Weston 2.0 isn't happening today since a handful of fixes landed since Weston 2.0 RC1 that Bryce found it better off to release Weston 2.0 RC2 rather than going straight to an official release. If no major fallout comes of 2.0 RC2, Harrington plans to release Weston 2.0.0 later this week.
The Weston 2.0 release has queued a big set of changes including a new output handling API, DRM compositor improvements, support for using EGL_KHR_swap_buffers_with_damage, initial window positioning for XWayland apps, desktop shell refinements, and an assortment of other fixes and improvements.
More details via this evening's Weston 2.0 RC2 announcement.