Playstaion 4 has keyboard support. I would bet the majorly of PS4 owners have a keyboard. They could do it if they really wanted too. It would even guarantee money cause you can't pirate games on PS4/Xbone. That's fine with them being PC devs first and foremost, but that doesn't mean they can't port it with the x86 architecture of both consoles at a later date.

@skate
a game that requires a mouse (only thing really used at all) on a console will not sell. only a select few would actually go with that.

as for piracy Civ5 would like to have a word, the devs idea on this is make a good game and there is nothing to worry about (smart people). Civ5 has sold over 1.4M physical copies (more than CivRev on ps3 and 360 combined) and odds are Steam has more than triple that number. It averages over 50,000 players online at a time (it came out in 2010) so sales are not anything they have to worry about.