From the Dockmaster at Utopia Planitia:
The Star Trek Online team have released three new Dreadnought Class [T6] starships for Federation Starfleet, Klingon Defense Force, and Romulan Republic factions.
The first vessel, available to Starfleet Captains at Vice Admiral Rank, is the Yamato Class Dreadnought Cruiser, based on the Galaxy Class Spaceframe this cruiser features a built-in Phaser Spinal Lance capability and Saucer Separation. The Yamato Class can be kit-bashed with Galaxy, Monarch, and Venture (if purchased) class section modules.
The second vessel, acquirable by Klingon Captains at Lieutenant General Rank, is the Kosali Siege Destroyer, based on the Nausicaan Garumba Spaceframe this ship type features built-in Siege Mode and Javelin capabilities. The Kosali can be kit-bashed with Guramba class section modules.
The third vessel, which can be requisitioned by Romulan Captains at Vice Admiral Rank, is the Kara Advanced Warbird, based on the Ha’apax Warbird Design this vessel class features a built-in Plasma Spinal Lance capability and Dual Vector Separation. The Kara Class can be kit-bashed with Ha’apax and Haakona (if purchased) class section modules.
Each of these starships comes equipped with a Supplemental Subsystems universal console and an unlockable Subsystem Redundancies starship trait.
Supplemental Subsystems Console
“Activating this console substantially increases your starship’s maximum subsystem power levels for a short time. While active, incoming energy weapon attacks damage the attacker, and leech a small amount of the attacker’s subsystem power back to you. Additionally, you gain a Subsystem Overload Counter each time you are hit with an energy attack. After obtaining 20 counters you emit a devastating pulse of electrical energy which deals heavy damage to nearby enemies. Affected enemies have all of their subsystems knocked offline for a brief period. This console provides a passive bonus to all subsystem power levels and can only be equipped on Starfleet Dreadnought Cruisers, Advanced Warbirds or Siege Destroyers in any console slot.” Source: Cryptic
A Level 5 Starship Mastery Trait. “While Subsystem Redundancies is slotted, firing a Spinal Lance, Javelin or Beam: Overload I, II and III will trigger a shield heal, a shield hardness buff and will restore offline shields.” Source: Cryptic
These vessels are also equipped with a hangar bay and are available for purchase in Star Trek Online via the C-Store.