Annual switch-over to new PKI/certificate set

Hi, we use a wildcard certificate which changes annually. I sent my partners the new public key, and I uploaded the new private key to my own Partner account.

Question :
Does mendelson AS2 automatically switch to the new PKI set on the day the old certificate dies ?
And what about my partners, will their AS2 instances use the new public key automatically.

OR

Do I have to coordinate with each of my partners to put the new PKI set in production?

thanks