Keelback
The Keelback was mentioned in a list from the Answers from the Devs where it said it is an upcoming ship.[1]
As this had never been heard of, people speculated that it was an alternative name to the Panther Clipper. However, on a stream David Braben revealed that it is a ship similar to the Lakon Type-6 Transporter, but with better weapon hardpoints.[2]