I will believe Edith's happy ending when I see it....LOL! I have a love/hate relationship when it comes to JF and it is more hate right now. Mary and Henry were blah this season and I did not expect that based on what I saw last CS. Still unclear why they brought Tom back.
Here it my bit of speculation -- a lot of it already mentioned. Of course, we have not seen the last of Bertie but when we see him again, he will be engaged Adela Graham. Paths will cross. Bertie will not be able to hide his feelings toward Edith. Enter Bertie's mother and this will result in a meeting between Bertie's mother and Edith. Hopefully, Edith will find the courage to stand up to her and this will lead to Edith and Bertie's reunion. Mary's cruel, jealous act (and yes, Edith should have told Bertie by that point) did make Edith face her worst fear. I originally thought Bertie was blah but found myself rooting for their ship and still am. However, at this point, I ship Edith/Happiness. Edith seemed to find some peace at the end of the episode.
Now, I enter real speculation. We know there will be a baby Bates. One life enters....one life leaves. Robert is too easy. I am going to say Cora or George. Now, there is a VERY big part of me that states JF would not kill a child, let alone air it on Christmas Day but have we seen Mary's big u-turn? The way the children we playing around the tombstones seemed ominous maybe. Then we see Sybil Cora Branson's name. Will JF bait and switch with Robert and have it be Cora? We have a big time jump in CS to allow for grieving.
As for Tom, I originally thought Laura but now wondering if it will be Adela Graham? Seriously, if I weren't shipping Edith/Bertie, I would be shipping Edith/Laura. Bananas! He coaxed Sybil over the wall. Will he do it again? Still think his character got the short end but hoping we will see a glimpse of something.