It's not just new ships, either. It's an entirely new class of ship. All of the five factions for Dropfleet Commander are getting them and you can get a look at these Lighters now.
From the post:
Low calorie space ships for your fleet? Yum yum!
Dropfleet players rejoice! This week we’re going to be releasing the newest class of ship – this time for all five factions!
Lighters are a brand new type of ship, slightly larger than Corvettes, but each one is just a little different. We’ve seen a couple of these in previous WIP Wesnesdays, but now we’re ready to unleash them all on the world!