From the Frontier Forums Here: https://forums.frontier.co.uk/showthread.php?t=151259
Quote from Edward Lewis (Original post includes a graphic):
Introducing the Diamondback Explorer
If you are a beta player you may have already seen the Diamondback Scout, but have you seen the Diamondback Explorer?
The Diamondback Explorer (picture foreground) was the ship featured in the concept art in Newsletter #70 back in April. This is a long range combat and exploration-leaning craft, sitting somewhere between the Cobra and the Asp. The Federal military wanted a cheaper, cut-down/smaller ship, and that became the Diamondback Scout, to use as a small multi-role attack and assault ship. The Scout (the smaller ship seen at the rear of the image) is also available to players, priced below a Cobra.
The Diamondback Explorer will appear in the latest Powerplay beta build.