I actually was discussing it with Ace in game a while ago, and here's what my thoughts on it were:
This weapon would be more endurance based rather than high damage. It would be an armor melter, but rather than creating a defensive screen or else launching out a single shell, this would be longer duration with effective armor destruction and perhaps kill potential.
The idea is to, perhaps, simply lay down withering fire into an area and attempt to keep said fire going. Rather than the slow fire and AoE of the Gas Mortar or else the quick-reload-small-clip Light Flak needing a quick trigger finger to make it fire quick enough, this could possibly launch rounds out over a longer range and with a large enough clip to simply clear a forward area.
While yes, the Gas Mortar is extremely effective against the basic fighters and acts as a melter, it's slow fire rate and reload, as well as quick dissipation, means that the clouds are almost more of a defensive weapon rather than an offensive one, especially since the gas doesn't affect your own ship or allies. This would take the role of offensive, plowing the road with lead, so to speak.
In response to current flak, this would have higher piercing rather than whatever the secondary damage type would be, which Ace and I discussed as being very lightly Explosive, though that might be a little too powerful. This would be designed to grind away at larger enemies, instead of simply hitting in a short spurt and then requiring the reload. With current flak, you could grind away with the Typhon and simply keep pouring rounds down, but it is a tad less effective against armor, and it has a substantial drop over a longer range, requiring a deal of skill to arc it appropriately. This would have an equivalent range but a much flatter trajectory, meaning that you could engage and strip an enemy while another ship lines up the shot, or else your secondary heavy Typhon readies for the kill.
Now, the major role would be a mid to long range armor stripper. The Minotaur can do this, yes, but it acts as a scrap-cannon, and for longer ranges requires Heavy. Not to mention its slow fire rate, horrible recoil, and small clip. This offers an alternative to a heavy armor stripper in an impressive and potentially deadly manner. It would deal less damage than the impressive Minotaur, but it would still be worth the time and effort to learn how to use it.
I hope I answered at least most of the queries, and this is a majority of what I remember from the conversation (It's been about a week, apologies mate)