Version 1.1 of the spec has been released. This version adds percept bundles and complex percepts as well as a few other minor changes.
Just some minor corrections and edits to the document. The protocol remains unchanges.
Although it has been around for a little while. Version 1.0 of the spec is now officially released.
The text of the latest spec release can now be viewed by clicking on a link at the top of the m2mxml home page.