The Bortasqu’ received the biggest update, giving the designers a chance to allow more variable pieces and let captains really customize the look of this iconic Klingon ship. The Scimitar, meanwhile, was redesigned to appear more traditionally Romulan compared to the original Reman lines of the design, and the Odyssey itself was given comparatively minor changes to reflect the state of the galaxy. The silhouettes and shapes of the ships should be recognizable to players who have been away from the game, but the new styling will provide more design options while keeping the aesthetics modern.
Source: Official Site