They will be more realistically sized, actually. Very tiny. And they are specialized against other fighters, but two or three of most fighter classes can take down a gunship, sometimes even a corvette, even if that gunship or corvette is piloted by a human. Anything larger than that makes brunch of them, though.
I had thought about making them useable by the player only through launch bays (which work a little differently in HOTS, I'll explain in a moment) but I don't want to limit the player's freedom of choice by preventing them from flying smaller ships. At any rate, should the player's ship blow up and they use an escape pod, they will re-spawn in a Carpenter. Also, one of the planned starting chär resources starts the player in a Tern class gunship, smaller than a corvette. I'm still undecided as yet, but I am leaning more toward allowing players to fly fighters and just giving the option to have a smaller escort via mission added. I thank you for your suggestions, though.
Launch bays. Where to begin? First off, there are three size classes; small, medium, and large. Small launch bays accommodate interceptors, light fighters, fighters, and shuttles. Medium launch bays are for gunboats, interdictors, and heavy fighters. Large launch bays are for cruisers. Now, buying one of these launch bays won't let you carry fighters right off the bat. You still need to buy a repair bay for maintenance purposes. After all, your fighters won't last long if you can't repair them or restock their ammunition. Launch bays just put a hole in your ship for them to fly out through. Repair bays actually store and repair the fighters, and there's one class of repair bay for each class of bay-carried craft. Small repair bays carry 6 craft, medium carry 3, and cruiser repair bays only carry one per bay. Multiple repair bays launch simultaneously.
There are exceptions to this. Eros bays carry eight craft because their design makes them more compact, though they can only operate from special bays on either ships, planets, or stations. As a result, Eros repair bays don't require a launch bay to install. The Onli Abeille, a combat variant of the Navette for bays, has its own bay like cruisers do, but also doesn't require a launch bay to install. This also means ships carrying Abeilles can launch them all in the blink of an eye.
I hadn't thought of point defense weapons on fighters, but it's kind of a moot point right now. You see, all turret weapons in HOTS are point defense. Additionally, every single ship is vulnerable to point defense. Larger ships can also mount larger turrets that will actually be useful in combat, rather than just shoot down missiles for you. I realize this is a drastic change from the norm, but I've tested it and it's actually pretty useful. For one, AI ships will fire their turrets at hostile craft in flybys without actually focusing on them, but focusing on another ship instead. It's also interesting to watch.