Not sure of the exact date, keep an eye peeled on the Ownhammer site, here is what Kevin said at the Fractal forum:
"I have not yet given the OK for full disclosure on what's going on with the small group of beta testers, which is why the teaser here and another from a week ago have not come with many specific details. I am still ironing out a few things, and as such need to keep things behind the veil until everything is set in stone. I will say, however, that this is part of a new initiative that will forge an utter - and in my humble opinion definitive - compendium in cabinet and speaker configuration permutations, not only for High Gain, but for Mid Gain and Low Gain as well over time for the Axe-Fx II platform(s). This is a parallel project to the MIX libraries I'm currently entrenched in that was born from a surge of creative energy once I returned from the mend of recent events in my personal life that have caused a lull in opportunity for activity.
Much will be disclosed soon, and commercial products will be available for consumption before month's end.
Oh, and I can say one more thing in total confidence: all your br00tz are belong to FAS+OH."