Well, attended San Fran brewers guild gala friday
and noticed that sour beer style beer was representing. Russian River had a mob for their special offering and I have to say I'm not a huge fan. Tasted several made w/Brett and few that achieved the sourness with out brett.
Don't know of any brewers that are producing this for market, but I am sure it will be coming soon if the Gala is any type of bellwether.
Oh and the Gala was an awesome time. 35 brewers came and they served up quality tasters. ThirstyBear barleywine was fantastic!