The game will be 25% off this weekend ($14.99).
Guys, it is not going to be $5. Ever. Spend the $15 and get it over with. This is easily in the top 5 best PC-exclusive games for 2009 (Zeno Clash and Gridrunner Revolution take up a couple of the other slots; not sure on the exact order though).
If you can't justify spending $15 on this game, you are seriously underestimating how much content and depth there is in it. It's is not a "cheap" game by any means, in terms of design, execution, quality, content, community, value, or any other qualifier. It's not like the throwaway bargain-bin FPSes that usually debut for $20. It's far better than the Call of Duty tripe that people happily shell out $50/$60 a year for, that's for goddamn sure. And the developer is one of the most badass in the business, to boot.
Buy it.