I'd rather the boss be another Archon Priest than another SepkisPrime
I'd be pissed if it's a giant servitor
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If you look at the dlc promos you can see Crota in the background for the TDB, and there is an Archon looking fellow in the background for the The House of Wolves. So it seems reasonable to assume that the raid boss will be an Archon of some sort.