There is a mod for Battlefleet Gothic Armada 2 that adds new ships. The team is the same, consisting of PistonMiner,Caliger and Imperator with help from Dire Venom and Skalgrim and Jonathan Zotack. Special thanks to Tindalos developer Iluv with helping the Chaos battleship hangars to work. Everything is open to change. Current stats in screenshots are for a ship testing build of my own, since I handle ship assembly.
Next up are the ships of the Dark Mechanicum. Boasting 10 bonus speed but at the cost of 5 less prow armour, these will be available to Skirmish Chaos, and to Chaos Legion and Chaos Marked fleets in campaign.
Maletek Light cruiser: Macrocannon broadsides, and anti-holofield macro turrets.
Heretek Battle cruiser: Same macrocannons, quad lance, expensive for its utility.
Xana Ark: Short ranged but very powerful warp lances, quad lance.
Samech Ark: Middle ranged anti-holofield missiles and quad lance.
Unless specified, these ships have the same other guns and attributes as Adeptus Mechanicus ships.