Two things spring to mind with your last response:
1. They can't give too much away or the black hats would have a field day. I've heard Matt talk of improved communications but outside pretty basic on-page guidelines I would doubt they'd go into any details about algo based penalties?
2. For people like us, if they introduce these at a later date and indeed they are as you describe, how do you reckon we'll get the message literally - I can't see them running their new emails retroactively to any site already in our situation?