The Natural Selection 2 Website announces that preorders are now underway on Steam, and that Unknown Worlds' action/strategy sequel is to be released next month, though they have not nailed down the exact date yet (thanks Joao). They outline the choice between the Standard and Deluxe editions, though between now and the game's release the only version being sold is the Deluxe edition at the Standard edition price. They have been accepting preorders on their website for some time now, and explain that anyone who took advantage of this prior to today will be getting a free upgrade to the Deluxe edition as well as a second copy of the Standard edition to give to a friend. Here's what the Deluxe edition includes besides the game itself:

• NS2 Official Soundtrack (almost 1 hour of music)
• Digital Art Book (40 pages)
• Exclusive wallpapers and avatars
• Exclusive new in-game marine armor