3 new systems, the Orbis space station and one new ship, the Hauler, will all be added to the Premium Beta on Tuesday, 24th June.
This is confirmed in Newsletter #28, released yesterday. It also includes some hi-res images of the Orbis space station (added to the wallpapers section, here), and the image of the new Hauler (above).
Premium Beta testers should note that although there will be a server reset, financial progress should not be lost:
“Premium Beta 2 will unavoidably reset your progress, although we will automatically gift you credits to the approximate value of your progress to date (including credits and ship, so you will be able to immediately buy your ship again).”
So, if you have any expensive weapons or upgrades fitted to your ship, sell them before Tuesday to ensure you are reimbursed enough cash to buy them back again after the release of PB2.