The images in question appear to use rudimentary image editing to reference older games in the IP’s catalogue, namely Star Trek: Armada, Star Trek: Invasion, and Star Trek: Deep Space Nine: Dominion Wars, along with a series of numbers that would suggest a spelled-out message.
Players on Twitter and on Reddit have been working to break these ciphers and have come to the conclusion that these are teasing a new ship bundle that packs in spacecraft from older games: Two particularly sleuthy Redditors have worked out the word “bundle” from the numbers strings, with some of the more popularly held assumptions being that STO will be getting the Premonition, Typhon and Achilles.