Unlike the upcoming Fallout: New California (which is an entirely self-contained adventure), The Frontier is designed to integrate itself smoothly into your adventures through the Mojave and have you first getting word of the northern campaign after you've got a few quests under your belt. Check out the dramatic and explosion-filled new trailer within. Fallout: The Frontier is an unofficial expansion for Fallout: New Vegas, and has you heading to the frozen north to aid a crew of New California Republic deserters in a massive new map (as big as the editor allows) against a well equipped enemy force.
Even if you're not on board with Fallout 76 taking the series online, we've got two full-game-length mods on the way, both due out before the end of 2018. It is looking like a very fine year indeed to be a Fallout fan.