Cryptic has published some info about Klingon Gameplay:

Klingon Gameplay | Star Trek Online Official Site

checkout the cool list of ships:

Warrior
B’rel Bird of Prey – capable of cloaking in combat.

Lieutenant
Bird of Prey Mk. 1 – capable of cloaking in combat.

Lieutenant Commander
Bird of Prey Mk. 2 – capable of cloaking in combat.
Raptor Mk. 1 – similar to Federation Escorts.

Commander
Bird of Prey Mk. 3 – capable of cloaking in combat.
Raptor Mk. 2.
Battle Cruiser Mk. 1 – similar to Federation Cruisers, but feature more forward-facing guns.

Captain
Bird of Prey Mk. 4 – capable of cloaking in combat.
Raptor Mk. 3.
Battle Cruiser Mk. 2.

General
Bird of Prey Mk. 5 – capable of cloaking in combat.
Raptor Mk. 4.
Battle Cruiser Mk. 3
Carrier – a massive ship with multiple hangar bays capable of launching several smaller fighters.