The Gathering of Scots in the American colonies involves some shenanigans in Jamie’s attempts to get a couple of babies baptized by a Catholic priest and culminates in Brianna and Roger officially tying the knot.
Spoilers ahead for The Fiery Cross.
His comments suggest that Season 5 will cut a significant portion of the events of the first chunk of The Fiery Cross, which does make sense, even if it does mean missing out on some fun moments of characterization (and surprisingly steamy sequences).