In the FedCom Civil War book, we learned the DC sent the FedCom an unfinished Kirishima hull, which later became the FCS Covenant. It states that it became the lead vessel of the Covenant class, and that the Kirishima underwent extensive refits and cosmetic overhauls during its stay at New Syrtis.
Are there any actual rules for this vessel, or was this just a one-off fluff bit(i believe the ship was later destroyed during the Civil War).