This was never an issue before, but now I notice it now that I have many answers accepted as the "accepted answer". We receive +15 rep for an acceptance. We receive notification in our reputation tab about "acc +15". However, when someone de-selects the answer, our rep decreases accordingly, but we never receive any notification on which question changed. I just wanted to know which question changed is all. Am I not seeing this somewhere or does this not exist yet?
This was implemented last night, you'll now see unaccepts in your reputation history (in the user profile).
I think it makes sense that you don't get notification because the deselection is actually wiping out the vote record in the DB.
No, you don't see it. You don't see any notification for revocation of upvotes or downvotes either. If the notification was in the time window you've speficied, it simply vanishes.