http://www.goldhawkinteractive.com/forums/showthread.php/5237-Post-Steam-Development-Process
Here is the relevant information from the lead designer:
1) $20 gets you a pre-order with beta access.
2) After the release candidate is placed on Steam it will cost $25.
3) It will be available on Steam (with Steam as DRM), Humble Bundle and Desura (both DRM-free).
4)The beta should be available tomorrow on Steam.
The Steam keys from Desura are out now.
An announcement will be made later today on Steam about the availability of Xenonauts.
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