There's a story on Eurogamer on "How No Man's Sky stole the show at E3," talking about the strong reaction to the showing of the sci-fi game. The game is a PS4 console exclusive, and they offer a sidebar exploring the possibilities of a PC edition:

Having one of the most striking games of the moment on its stage was certainly a boon for Sony, though it's still not clear exactly what the exclusivity it has on No Man's Sky means. “The wording is we're doing a console debut on PS4,” says Murray. “The thing that that leaves open is a PC version.”

Does that mean a PC version could arrive day and date with the PS4 No Man's Sky - or possibly even before? “If I'm honest, we're taking on quite a lot at the moment,” says Murray. “We're definitely coming to PS4. I would like to come to PC. Whether that arrives the same day - we're a small team!”