I don’t know if this is a question or a submission, but I’m going to answer it now ha ha! The privileges of being the admin of this :D.
I think we will get to see the baby. I saw some stuff about season 3 and how the arrival of a baby is in the script. Season 3 starts in early 1920, the Christmas Special was Christmas of 1919, so I think it might be Sybil/Branson’s kid.
I also agree about how they got swept under the rug. They’re my favourite couple personally I couldn’t care less about Mary/Matthew (NO REGRETS FOR THAT UNPOPULAR OPINION) so I hope they’re around quite a bit for season 3.