Because this one of the funnest things to do here with Armada's long development cycles. Time to do some speculation and theorycrafting on things we don't have yet. Lets first approch the wording in the reveal with caution. More or less it attempts to communicate a token which is a offensive rebuttal to a attack. Lets see if we can ascertain the design of this token and glimpse its possible strenghts and weaknesses.
Possiblity 1: Automatic damage resolve to attacker.
This is first version to come to mind if you read the reveal as is. This reason alone should make me discard this version but you never know. If this version is true then Agate(officer) ability is reading your oppenents dice when it resolves(Seems odd and weird).
Weaknesses: ship based plink damage, fighters
Lack of varing and engaging weaknesses is another reason to discount this version. The way this version is leveraged is its High risk, high reward swinging. This take is most streamlined but more unfun, less engaging. It's ability to punch way out of wieght maybe too much for the game.
Possiblity 2: Attack generation
There is alot making me lean towards this version since the game has precedence with counter. This would make it an outside activation attack. Meaning no CF token usage. With the limitations possibly gleamed from Agate (officer) taken to the extreme this leads to an limited to unmodifyed attack roll. leaning towards the defending arc generating the dice.
Weaknesses: Positional play, Natural dice reliablity, fighters
I see themematic allure in this approch in how it communicates ship gunners discarding firing solutions for ripid fire.
The Future of Salvo
Salvo seems to be an interesting way to increase the intensity of the game heading into the Clone Wars era. An out of activation attack(s) tied to defence token could help bring the hectic captial ship engagements seen onscreen. I expect both faction to have decent proliferation of this new token. The Republic might be in the best position to build faction identity off regaining some power during a salvo. Would be a good way to express the elite trained and drilled clone crewmen.