Vulkan

Vulkan is the OpenGL replacement that allows multicore CPU usage. I think this is pretty cool. Basically, before we could do something like this
glBegin(GL_TRIANGLES);
glVertex3f(0, 0, 0);
glVertex3f(1, 0, 0);
glVertex3f(0, 1, 0);
glEnd();

But with Vulkan, we can do this in parallel. Basically using following code:
vkBegin(VK_TRIANGLES);

....
thread1: vlVertex3f(0, 0, 0);
thread2: vkVertex3f(1, 0, 0);
thread3: vkVertex3f(0, 1, 0);
....

vkEnd();

So what do you think? Personally I think 2015 will be great for Linux gaming.

Too bad game industry revolves around cash cows and micro-transactions now. Better graphics won't save it.
Gameplay realism direction - the race for perfect simulacrum, completely ignores the purpose of games(to have entertaining or challenging gameplay). Stupid ,indies, low-content and mobile games are exploiting the real gaming direction - the perfect gameplay container. Audiences who want the simulacrum actually don't want to spend any gameplay effort, they want to see their fantasy an interactive movie with themself as protagonists. They aren't actually gamers. Once VR technology gets mature, all these simulacrum-direction games and their supporting industry will disappear(VR developers will get some, but it will be really different rules and worlds, entire graphics-heavy genres will be extinct/replaced by VR simulacrums of their "gameplay rewards"). Angry Birds will still remain. Tetris will stay. Real games are like chess: they don't age.