As we saw earlier in the Kick Off preview, when new versions of old models come out, companies can take that opportunity to change some things up on them. The I.K.S. Gr'oth was originally released waaaaay back with Wave 0 of the Star Trek Attack Wing game. It will also be part of Wave 27, with a spiffy new paint job as well as new upgrades.
In the new expansion kit, you've got things like the Stasis Field, which can totally neutralize an enemy ship's shields and an attack for a round. Then there's the Magnetic Pulse which can do damage to the enemy ship's hull, even if they still have shields around. And then there's Tribbles. Because having those little balls of fuzz around can actually help your ship out in the short-term, if you believe it.