Valve has promised to launch Steam for Linux before the end of 2012, and last month it was confirmed that an external beta would be happening in October. It’s limited to 1,000 people, but the point is Valve seems to be on track to meet the release target of this year.
What we don’t know is how many games Steam for Linux will have when it does launch. Steam for Mac had over 50 on launch day, and while we can’t guarantee that level of support will be reached, we can point to the fact 15 games on Steam support Linux already and therefore should be available on release.