I have no idea if anyone already addressed this but I had some ideas I wanted to write down just to keep track of them and see what other people thought.
I love Lower Decks and although I understand why some fans are reluctant to call it canon, I view (most) of it as canon and one of the most exciting things about a new show is the new ships it brings to canon. I know these ships have been around since the first season but I haven't seen much about them and they intrigue me.
In this picture there are two new ships- I think. To me, it looks like the left ship and the right ship are mirror images, but flipped, which I am assuming is because they are oriented differently but of the same class, while the middle ship (top, above the station) is obviously a different class.
In the Star Trek Encyclopedia, the USS Portland NCC-57418 from DS9 was a Chimera class starship. To me, it sounded like a small frigate or destroyer sized vessel, and the registry indicated that it was a mid to late 24th century design. A perfect candidate for the smaller ship class (I still haven't decided if I like it better with the nacelles on the top or the bottom).
The USS Yellowstone NCC-70073, mentioned in DS9, was classified as a Sequoia class ship in the Star Trek Encyclopedia II. I imagined it as some type of cruiser, roughly the size of an Ambassador class starship, with design elements similar to the Galaxy class due to the registry being in the same range as several Galaxy class ships. The second ship type, seen in the middle of the picture, matches this, with a semi triangular, spade-shaped primary hull and a wide secondary hull. This is a nice break from the circular/ovular saucer sections of most of the fleet and seems like a nice addition to the Galaxy class family imo. It seems like a robust light cruiser, a compliment to the Galaxy and Nebula classes, perfect for patrolling Federation borders or surveying new systems.