If they're exploring the love story between Gwen and Miles, Peter, MJ and their daughter can tag along to show what it's like to be partners and have a family. There's a good chance they'll base them off of the Renew Your Vows versions.
Unless they skip ahead into the future in Peter B's alternate dimension, then he won't have a child, but a baby (or not).
The teaser implies only a few months have gone by, at most.