Celebrated by both the Horde and the Alliance, the Brewfest ( http://www.worldofwarcraft.com/info/events/brewfest/ ) is a time to enjoy the fermented fruits of the harvest: pretzels, cheese, and booze! The competing breweries Thunderbrew, Barleybrew, and the Ogres, all come together outside of all the major cities in a bid to outdo each other with their special ales, meads, and beers. This year's iteration of the holiday includes new achievements. Brewfest runs from September 20 to October 5.

I’m sorry to say that, at present, there is no new Brewfest Stein for this year, nor is there planned to be.

Sincere apologies for any annoyance this may cause you, but hopefully some will be pleased by the ability to catch up on something missed out year. 

[...] There may be nothing new for characters who have achieved everything in the previous year, but let's not generalize for the entire player base.