heures new stats
Nothing has been announced timewise but it’ll be sometime today.
There’s other threads in Matchmaking you can check out for further Season reset discussion. 
You asked this yesterday and received multiple answers
https://www.halowaypoint.com/en-us/forums/58b8518e005f432381ab99fbcaf931e0/topics/new-saison-for-arena/76df5ccf-bead-48e8-a37d-b7c11be99af2/posts?page=1