Were I to do it right now I would have extra clothing, some ability to cross creeks and immediately change into something dry, like perhaps some sandals for fording or a dedicated pair of hefty wool socks for wading. Extra food for itinerary problems, like backtracking or bailing. Extra padding, full length, for snow camping. The ability to stake a tent in snow, like snow stakes or baggies to fill and bury. An ice axe for navigating snow slopes; I would avoid travel across dangerous slopes when the snow was firm or frozen.