A Czech brewery is launching a 21% beer. Not surprisingly, at this strength, it is dark and as it is a Czech beer, it's bottom fermented. It is described as a doppel doppel bock. So that'll be a quadruppelbock then?!
It will hardly come as a shock that they are looking to export it to USA who get all the good beers in both senses of the word.
This doesn't seem like the type of beer which would be too popular in its homeland but will appear to beer geeks the World over. I doubt very much though that we will see it in the UK sadly.