As it seems that we are unlikely to see a convention in Errata so we know which ships have been changed at a glance, I have had a go at working this out, for the Feds, Klingons and Kzinti:
ACTA:SF – Ship Updates – Errata 19/03/2012
Changes since last update highlighted in red, ship point cost shown in brackets.
Federation
Police Cutter: Add Labs 2 (85)
War Destroyer: DWD variant is +10 points (120)
Battlecruiser: BCJ variant is +0 points. The new Photon Torpedoes form a separate weapon system (215)
Klingon
E4 Light Frigate: Add Labs 2 (75)
F5 Frigate: Add Labs 2 and Tractor Beam 1. Increase Damage to 14/5 (100)
D6 Heavy Cruiser: Change Transporters to 5 (150)
D7 Battlecruiser: Change Phaser-2 fire arcs to A, P & A, S, and reduce to 2 AD. Add another Phaser-2 weapon system with fire arc T and 2 AD (170)
D7C Variant: Completely replace entry with; Replace Turret fire arc Phaser-2 with Phaser-1, change Marines 8, Anti-Drone 2, Transporters 7, add Command +1. +30 Points (205)
C7 Heavy Battlecruiser: Add Command +1 (240)
C8 Dreadnought: The phaser-2 systems should have a Range of 12 and Kill Zone 4. Add Command +1 (345)
Kzinti
Frigate: Change Disruptor Range to 15. The PH and SH Phasers-3 should have 1 AD (120)
Light Cruiser: Add Labs 4 and Tractor Beam 2 (150)
War Destroyer: Change Turret arc Phaser-1 to Phaser-3 (150)
Medium Cruiser: Change Damage to 22/8. Change Phasers-1 to 1 AD (160)
New Heavy Cruiser: Change Damage to 30/10 (170)
Battlecruiser: Change Turret arc Phaser-3 to Phaser-1 (200)
Heavy Battlecruiser: Add Command +1 (260)
Dreadnought: Add Command +1 (330)
Please let me know if there are any mistakes,
Cheers.