Version Beta 2 of the IFML standard has been finalized in these days by OMG.
You can find the resources (specification document + machine readable files) at this url:
http://www.modeldrivenstar.org/2014/02/sneak-peek-at-IFML-beta-2-OMG-user-interaction-flow-UI.html
Beta 2 version is candidate to become version 1.0 of the standard.
