Western release: March 7th.
Game is now available for preorder via the Squeenix store (which, thank god, has changed its user interface so now it’s possible to actually place an order). If you’re feeling particularly rich they are offering a Black Box limited edition version as well; otherwise, Day One release.
Should note that the latter, to my knowledge, is not a Squeenix store exclusive, so if you go through a different retailer it will probably offer the Day One bonuses within the next couple of weeks once it becomes officially official.
(To be perfectly honest I would recommend, if you aren’t interested in the Black Box, going through another retailer; Squeenix Store has been fixed since last I browsed it but it’s still kind of awful and doesn’t provide release-day delivery because fuck you for giving us money, I guess.)
PS4 demo to be released within a couple of weeks.