After the events of 4x11 - Our heroes have found themselves thrown into six weeks of absolute calm...but as any resident of Storybrooke knows, things rarely stay calm for long around these parts. Pregnancy, fluff, romance, action, angst - it'll have it all.
Why is Killian seemingly impervious to the treacherous Maine winters and frigid temperatures? Why does he never have a decent coat on? I don't know - but I do know that it's going to come back and bite him one day. Humor/fluff.