Star Citizen, and not just because the Arena Commander module went from its first release version to 1.0 over the course of the year. A recent letter from project head Chris Roberts states that over 2014 the studio has gone from having 70 employees in one location to 180 employees in four locations across the globe. He also notes the huge increases in funding that the game has seen from both new backers and old.
So what's in store for 2015? Big stuff for backers. The first episode of Squadron 42 and the beginnings of the game's persistent universe will be reaching backer hands, along with the first iterations of the FPS module. There's no exact timetable given, but the developers are certainly planning big for the year ahead. Take a look at the full letter for more statistics on the year past and the one just begun.
[Thanks to Cardboard for the tip!]