The speculation is that they are trying to get their parents to patch things up before divorce becomes a major topic on the show. Other things that you can expect, according to reports, include the focus on the life of Toby and Lily as they raise their child.
Everyone knows that it is not easy to be a first time parent, so the show is going to focus on the struggles and the fact that something huge could happen to the couple during this season. The show is filled with drama and the fifth season is expected to bring more of it and even more emotional episodes than fans have seen before.
Production for Switched at Birth season 5 is happening right now, so the details should be coming out little by little over the next few months. That will keep fans happy and get them ready for the start of the season which has yet to be announced.