The Brewers Association has released their 2013 Beer Style Guidelines. 2013 version defines 142 styles of beer, up 2 styles from last year.
This year, Adambier and GrÃ¤tzer styles were added for the first time ever. Both are historic pre-Reinheitsgebot styles that are making a slow revival among U.S. and international brewers. Adambier and GrÃ¤tzer are historically smoky ales, with the former thriving in and around Dortmund, Germany, and the latter brewed primarily in Poland.
Also, guidelines were changed for American wheat ale “… by which all-wheat grists are used in the brewing process.”