So much speculations...
Alright minor spoilers:
1. There will be 4 >3 000 m ship classes (largerst one- 3500 meters long) in the Tiigran Navy, all others will be 3 km or less (starting from 18-20 meter fighters, through 70.7 meter heavy bombers and gunships that will be flyable and 130 meter cutters, which will be the link between strike craft and capships. Anything bigger, and all the specs remain a mistery on HLP, at least for now

).
2. The Shivans will have far more
EVIL ships (such as the Gorgon and subspace rift armed Lamia seen on screenshots) than those met in FS 2, and I have a good story to explain why they didn't appear earlier.
3. And the 80 juggs are only
part of the Shivan fleet, as most people probably assume
4. Finally- the Tiigran-Merisst ship quality (not uber-bbqfullness or numbers- that's the Shivan school of fighting, but rather good and balanced design without going to any extremes), and something not known much in the FS Universe called
tactics is their way to counter armies of juggs. (just in case anyone asks how they manage to fight a war with the Shivans without being owned in 48 hours)