I would guess Corvettes come in squadrons, but are not married to a mothership or capital vessel.
Given that there is a standard for corvettes, which even sci-fi has managed to follow quite well, above is the only real question. I imagine that they would have to be independent, like frigates, both in order to function in a significant way (probably as affordable skirmishers) and because marrying them to a capital vessel would demote them to the status of 'gunship', an idea already explored in mods. Although I can see Titans potentially manufacturing them, and even frigates, I do not see them being married to Titans.
More importantly, what variety of corvettes will be available? This has already been discussed to some degree. Corvettes can potentially have forward firing weapons designed to skirmish with frigates and cruisers, turreting weapons to sweep strikecraft, slower firing guns for capital ship harassment, and any number of support systems.
Given that this class of ship is certainly larger than a strike craft and more than likely below the size of a frigate, and very likely will not have a frigate's antimatter reserves
I would concur. Although there are no certainties, it remains reasonable that corvettes would be used for their raw strength in numbers, although the aforementioned gunships have broken this mold and might have influenced the developers.
it seems likely to me that corvette chassis will not be jump capable on their own,
I would generally disagree, but this is a gray area, at best. We have little to go on concerning the subject, but the developers might find it a new challenge for players to have a vessel which requires docking for stellar transport, but are unmarried to a capital vessel, and thus do not auto-dock.
If such is the case, this implies that corvette chassis ships will operate in squadrons as strike craft do, though understandably of smaller number.
Although not necessarily, it is a consideration. They could be made one at a time and require manual docking or have an order which ties it to a capital vessel, causing them to auto-dock when the capital vessel is given orders to jump. This could be the same case even if they are made in numbers, as with Homeworld 2. There are a myriad of possibilities.
Also, it seems to me that at least one chassis of corvette is likely to be a dedicated frigate killer
Most certainly agree.
It suddenly occurs to me that there isn't exactly a 'privateer' class of ship
I forget which, but I know there is a capital vessel that can do this. It's not completely unexplored, but could use some more development. The difficulty lies in the lack of open areas to do the task. There are large areas of the ocean that go unpatrolled. Here, the phase lanes are areas of neutral activity and gravity wells are usually well defended. Even still, corvettes with the appropriate speed and strength to strike quick and hard at smaller vessels while accumulating wealth would be nice.
There's also yet to be 'stealth' craft in the game.
Whiskey is right, but you have an intriguing idea. I support it, but only if it is balanced out properly. That depends on the developers.