Microsoft loves to use codenames and from the past few years, there are two in particular that you may recall; Blue and Threshold. With Windows 10 (Threshold) coming to market sometime this summer, Microsoft is already starting to work on the next update for the OS.
Microsoft has said multiple times that Windows will be moving at a faster cadence than in the past and they are already working on a release for 2016. The codename for the project is ‘Redstone’, a popular item in the recently acquired game, Minecraft.
So now we know why they acquired Mojang.