And another thing…
Season 1 was about Cassian’s conversion, obviously. Will Season 2 feature someone else’s conversion? One possibility, entirely speculative, is that Dedra will turn. The Empire has started to fail to live up to her expectations (not taking prisoners from Anto Kreegyr’s group, for example), and I could imagine that learning of the Death Star would somehow push her over the edge.
I assume that ISB does not yet know of the Death Star; it will be interesting to see if Dedra’s attempts to regain status after her total failure at Ferrix will somehow lead her to discovering its existence.