The e-mail message asking about a migration guide to Wayland can be found here. Among the questions were about ICCCM/MWM/EMWH equivalents on Wayland, Wayland's support for non-drawing parts, about Wayland mechanism vs. policy, and about Wayland window stacking/raising.
There isn't such a guide, at least not yet, but responding to this developer's questions were several upstream Wayland developers, including Kristian Høgsberg. So for anyone wanting to learn a bit more about some Wayland technical details, the email thread is worth reading through.
Wayland and the Weston reference compositor continue to move forward at an expedited rate.
In other Wayland news for today, Tiago Vignatti worked out support for transient surfaces with XWayland per this patch-set that was announced this morning.