MightyApe (most people's go-to site in New Zealand) says 27th March, 2015. Everyone seems to have something different, I'd just wait for word from NRS.
Amazon always pre-cums before actually coming, like for example they sold GTA V on a friday the week before GTA V was supposed to be released and Rockstar was pissed. So I'll will hold speculation.
Also, the game is coming out for last gen systems, which means the release should be sooner rather than later, as they are betting it will be early enough in the XB1's and PS4's life that many will not have upgraded by then.