For players who don’t have headstart access, the game is unlocking for early access tomorrow, so it’s not going to be a lengthy gap between releases. Prospective players should be aware that the game will still contain bugs, as it says as much in the day’s headstart announcement (and whatever bugs are in there today are likely to still be there tomorrow, let’s be realistic). Still, if you’re feeling the pull of smashing the heck out of some vaguely demonic enemies, the headstart players can get to work on that today. Everyone else just has to wait a day.
Source: Steam page; thanks to Ville Uusitalo for the tip!