Weston, the reference compositor to Wayland, now has support for output configuration from the Weston config file, i.e. the equivalent of configuring your output options with an X.Org Server from the xorg.conf
Scott Moreau added in an [output]
section to Weston's main config file that allows for outputs to be configured. From the general Weston config file this now allows for outputs to be specified to a specific mode (WIDTHxHEIGHT), off, preferred (the native mode), or current (whatever the mode is currently set to when launching Wayland). The Weston config file is formatted in a simple INI-style text file.
Below is an example of what the output configuration for Wayland/Weston could look like:
The latest patch for this output config support is currently on the mailing list
but Kristian Høgsberg has expressed interest in already pulling this support to the Weston Git repository.