I would expect to see a 3.0 sale where a number of unavailable ships are made available. However, expect the price to increase significantly from concept to flight ready. the 140 the prospector was at will probably go to 170ish with 6 month insurance. If there is a sale at gamescon outside the 6-8 ships I expect with the trading cards, it might still be the same 140, but again, with 6 month insurance.
From what I have seen, the mining laser is NOT active in on the current build of 3.0 being played at Gamescom, so mining is out for 3.0 as they are doing bug fixes right now. I am not sure if mining will come in 3.1 as originally promised or not as I've not seen it on the progress report for quite some time.
Edit...Thinking on it, I think the 6-8 ships that will be sold for gamecom with the GAMESCOM2017 promo code will be the Prospector, Aurora, Dragonfly, Ursa, Nox, Cutlass Black, the Aquila. I also and the 600/615 concepts on sale. (Basically, the ships being renewed/flight ready for 3.0