So SeanW just dropped a video saying he had heard that in season 6 there was going to be a non Spartan armour core. However he said it wasn’t an elite and wouldn’t confirm what it was.
In the Halo Infinite art book there’s an image of a droid with UNSC regalia. Think something like chappy but with a Spartan helmet style head. So perhaps that’s what we will be getting in Season 6?