Halo: The Master Chief Collection - Season 5 Trailer
From Halopedia, the Halo wiki
The trailer shows a number of armor sets from Season 5 including those included within the season's unlock scheme. However, the trailer also shows a number of armor sets not included in Season 5 as hints toward upcoming content. These include the Infiltrator and Nomdagro suits later featured in Series 6: Raven and the Operator suit, which is currently not available.