The Block III variant of the Celestial-Class, updated with the A-Poly-T armor used on the Archangel as well as the new PHALANX-HALO variant. This modernized version of the ship was used as a stopgap to bolster the Alliance's Dreadnought numbers when Archangel-Class production lagged due to production complications.
They all have always had point defense lasers. The difference was moving from a turreted design to a phases static array design. Block III Celestials retain the turrets