I tried it.
It's a copy of your main savegame you can select and activate from the main launcher.
It will NOT bear anything in your main game so play it rough!
Most of the new toys cost only 100 credits. Ship included.
Had some fun with the New Fer de Lance.
You can see there's some work still to do as many animations and such are broken.
New GUI in game is pretty much more of the same slick perfection we are used to even though still no HUD colour customisation in-game. Only INI crack (which is game safe!)
External camera is active and pretty nice. Careful to use it when safe as you are completely immobile and vulnerable.
When beta period expires all is lost, so- really- ride it hard.
PS: took me quite some time to download it.