Thai Airways have this year taken delivery of two Boeing 787-9 Dreamliners, HS-TWA and HS-TWB. Both aircraft are to be full time employed operating solely between Bangkok and Auckland on daily services with the first of these arriving into Auckland 17 November 2017 as TG491 flown by HS-TWB.
Thai has operated 6 of the smaller Dash 8 Dreamliners since mid 2014 and their first Dash 9 was delivered mid September this year while today's visitor was delivered 31 October 2017.
http://www.nzherald.co.nz/business/news/article.cfm?c_id=3&objectid=11944272
While the Dreamliner is scheduled to operate daily services, today (18 November) the type is being substituted by Boeing 777-300 HS-TKX.