No Man's Sky will be a full-priced game, and pre-orders will open tomorrow, according to a now-deleted post on the US PlayStation blog.
The entry listed the hotly anticipated procedurally-generated universe exploration game as costing US$59.99, and "out 3/3 [in North America]."
Given how improbable a surprise release is, especially since the game has thus far targeted June 2016 for release, the date likely refers to the opening of pre-orders.
US$59.99 (approximately AU$80 / NZ$90) is an unusually high price for a digital indie title, but then again, No Man's Sky has been in development a long time, and in a sense offers a practically limitless array of content.
Since securing it for PS4, Sony has treated the game as a prestige title, promoting it heavily at trade shows and news conferences.
No Man's Sky will (probably) still be released in June for PS4 and PC.