All three ship styles feature the Ablative Hazard Shielding console and the Emergency Weapon Cycle trait to be unlocked, with the former providing a last-ditch bit of durability and the latter offering a larger buff to Emergency Power to Weapons. Yes, you’ll need to grab all of them from the store again, either in a bundle with the three of them or individually. Still, if you loved your Tier 5 incarnation, you might want to consider picking one up.
Star Trek Online, but your upgraded Tier 5 Battlecruiser just isn’t the same as a Tier 6 version of the same ship. It’s a bit disappointing. Or it would be, if not for the fact that you can soon get a Tier 6 version of the ship from the C-Store, complete with the options to use the look of the lower-tier cruiser for all three factions.
Source: Tier 6 Battlecruiser Preview