Update: Somehow Tom King read my post here about not getting through to him via email, so he contacted me via the Kemperforum (thanks again, Tom!). And these are the news about the Active wedge (I hope it is ok if I post it here):
"We're out of stock on the Active Wedge. New inventory for Europe is expected in late June/early July at this point. We are just waiting for a few long lead time parts to come in then we'll go right into production."
End of the story: I switched to the Active Cab, which is still in stock and I'm very excited!