tl;dr seems Mikasa got married and had a kid, died of old age, Paradis got destroyed years later after her death, then we see her descendant playing in the ruins of Paradis.
People speculate she got married to Jean but it's never explicitly shown. I assume the warmongering Yaeger faction that took over after Eren died was the cause of Paradis getting fucked to oblivion though. They also show an extra page with Mikasa talking to Ymir and it shows her dodging the spear that killed her in the past and killing King Fritz instead but doesn't seem anything changed unless you wanna go with an alternate timeline was created where Titans never became a thing.