Sherlock is looking forward to not having to be constantly concerned about Watson as well, and also mostly because he knows the toll it takes on her, as she is fiercely independent.

When the coffee is done he puts it on a tray along with a couple biscuits and some fruit, and heads to the bedroom. He sees Ted petting Watson's hair as she sleeps, and it's such a tender scene that even cynical Sherlock feels warmed by it.