Mailing the story:

Valve is preparing to unveil glNext at the upcoming GDC 2015 in March. This is supposed to be the successor of the current OpenGL and it might be the one thing that could really turn Linux into a gaming platform. OpenGL is a powerful platform and it's being used by developers from all over the world for the last two decades. And this has probably become a problem. Now Valve has entered the Linux world and the company doesn't want to sit on the sideline, just waiting for miracles to happen or just using what's already available.