The New X.Org Server Driver API Is Coming
Phoronix: The New X.Org Server Driver API Is Coming
The new driver API for the X.Org Server that would finally allow for the X.Org stack to better compete with modern desktop drivers on Windows and Mac OS X, may actually see the light of day, prior to the Wayland push...
Not X12, a change in X.Org implementation
X12 would be about an (incompatible) evolution of the X protocol to fix the issues of the X protocol.
Here it's about changing the implementation of X.Org: contrary to what many believes, to fix many current issues of the X server, changes of the X protocol are not required but its a manpower issue: see David Airlie's end of the blog where he is (bitterly) joking that noone will port the drivers to the new API.
And those who believes that Wayland will fix the manpower issue are just dreaming..