I'm getting the impression that Warwick are concentrating on their US market, as well as their German home market. When I spoke to the reps at their LBGS stand last March they actually said they were going to try and improve their position in the UK market - but I imagine they will also have to stop demanding that resellers stock a large number of extremely expensive models no-one can afford before allowing them to become distributors.
I only have Rockbasses but the Corvette 5 GAS hasn't gone away. So far I've only bought new (from Thomann, when Sterling was strong against the Euro). Then again, I'm a leftie and most of the time have no second-hand choice.
Unfortunately the Warwick_Official account here on Basschat, previously run proactively and helpfully by Garey, has been dormant since he left the company.