For those who know, 3Now now has been upgraded and refreshed with new features, very much like the TVNZ OnDemand App.
While the apps are ready for iOS, Android phones and tablets and Apple TV Air Play, the HbbTV (or FreeviewPlus app) is not updated at the moment, there has been no timeframe set yet, Which means you are still able to use the old 3Now HbbTV app as normal until the upgrade comes. By then get the 3Now Account set up to continue using the service.