In case ya'll haven't already heard, Microsoft has bought Mojang for $2.5 billion dollars. Mainly to acquire Minecraft. Notch and the other founders are not staying on and plan on leaving for other projects. The status of the Stockholm office and its employees is currently unknown.
Notch leaving will not have a major impact on Minecraft as it is today, seeing as he has not been working on minecraft for quite sometime now. As for the current minecraft staff, such as jens, dinnerbone, grum,...
Microsoft buys Minecraft