Future foals(Slight finale spoilers) · 10:29am Oct 14th, 2019
And, since I can't stop rambling about the finale, another blog post.
It seems like, judging by the dialogue of Rainbow Dash and Applejack discussing doing chores together, that they are married in the future. Discord and Fluttershy seem to be as well.
The only two confirmed foals are Lil Cheese and Big Mac/Sugar Belle's son.