It does sound like he's playing nice-nice for now. How long it'll last depends on how many mediation sessions there are, if I had to give my cynical guess.
And I am not all that sympathetic towards a WAS having to squirm because of the situation they created. So he's uncomfortable around your friends, huh? I say, tough cookies, bud.
Anyways you sound great and appear to be in your element performing in these plays. Keep on doing what is best for you and the kids.