I think he will consult, just like Bea Costa and Kevin Moore (who incidentally is working with Robby Ingerbretsen) - all ex WPF people.
The big shock for me was Brad Abrahms a month or so ago, I wish there was an edition of news like the spectator, we need to know why. That guy had future General Manager (maybe VP) written all over him. Thing is he was quite young, and probably got impatient.
The nice thing about having a longish career working in a number of different areas is that after a while it stops being about the job and the money. You get to take a step back and pick something that will be interesting. Like you say, he might consult and eschew the whole 9-to-5 thing for a while.
Have fun Adam!