Not that asred about new ships, at this point. There's plenty of variety now and I'd rather see the work go into other areas.
If we must have more new ships, I'd like to see more SMALL ships (Gecko? Falcon? Kestrel? The latter was an atmospheric fighter jet refitted for space) and maybe a couple of really large ships (Panther Clipper LX, Boa, Imperial Explorer). Medium ships now dominate, which is lessening the sense of scale in the game a bit. Back in 2014, you'd see a Type 9 or Anaconda flying among the Eagles and Adders and Cobras, and you really felt they were huge. Even an Asp seemed big.
Adding tiny interplanetary cargo vessels and local shuttles to the NPC traffic at stations/outposts would also help. Smaller than most small ships, don't have high wake capabilities, but can fly between nearby planets. Let them use the small "slots" on the side of outposts and installations. They're already part of the game's continuity, they're in Elite fiction, have been mentioned on Galnet (RIP), I think there was even one in the original Elite (called Worm, I believe).
We don't need to be able to fly them, though it would be cool to have one as a cargo SLF for outposts. Just to have them buzzing around would add to the level of activity and scale.