The original game was one of the most interesting released in 2014. It was visually striking and bleak in tone, depicting the flight to safety of two convoys of refugees from opposing sides of a Viking-esque fantasy continent. The game was notable for its near-total lack of exposition, dumping you into its world and letting you work out what's going on only gradually. There was also some fine turn-based combat and some brutally unexpected plot twists, not to mention a rather unforgiving difficulty curve and some rather bizarre game mechanics. Still, it was a very solid game, especially for a debut title from a new studio.
The game was always planned as the first in a series, so it is surprising that the sequel was not announced sooner. However, Stoic ran into legal problems earlier this year when King Software, the makers of Candy Crush Saga, sued Stoic on the grounds (of questionable sanity) that they owned the word 'saga'. Fortunately, logic (or a finely-tuned realisation that a PR backlash apocalypse was imminent) prevailed and King dropped their claim, allowing Stoic to proceed with the series.
The Banner Saga 2 will be released in 2015 on PC.