From the DLC Plan Update 1
The first DLC Story Operation features Attikus and his twisted recount of the thrall rebellion he led to overthrow his Jennerit oppressors. Each DLC Story Operation is a highly-replayable scenario featuring one of Battleborn’s heroes.
I’m assuming (knowing the risk) that the story operations can be played like the main story missions meaning either solo or with up to a full team of 5. I’m also assuming (same risk) that these story operations can be played with any of the heroes and not just the featured one of that story operation. If this is the case and in Operation 1’s case where Attikus is simply featured (not unlike Boulder in The Experiment) then I’m all good. It can’t possibly mean that these operations can only be played with the featured hero of that story. If that IS the case, there’s still time and fix that now 
Also, my last assumption (for today anyway) is that these story operations won’t need to be ‘unlocked’ (other than by purchase / season pass / digital deluxe) and I don’t need to hold onto credits or hero keys for them. I have the digital deluxe version so I’ve been playing it that I’m good to go using keys to unlock the new heroes and spend my credits on loot packs and the like.
Thanks