My small contribution to trends: sorted list of # of entries in GABF beer competition, highest number first. IPA is most popular - pumpkin beer is least popular. All is for the best in the best of all possible beer worlds! Remarkable for me: coffee beer is 4th, German-Style Sour Ale is 8th, Belgian beers are not as trendy as I thought they would be.
American-Style India Pale Ale
Imperial India Pale Ale
American-Style Strong Pale Ale
Coffee Beer
Wood- and Barrel-Aged Strong Beer
American-Style Pale Ale
American-Style Sour Ale
German-Style Sour Ale
Wood- and Barrel-Aged Strong Stout
Session India Pale Ale
German-Style Pilsener
Golden or Blonde Ale
American-Style Amber/Red Ale
Herb and Spice Beer
Chili Beer
German-Style Koelsch
South German-Style Hefeweizen
American-Style Amber Lager or Dark Lager
American-Style Fruit Beer
Robust Porter
Belgian-Style Tripel
Field Beer
Specialty Saison
Imperial Stout
Australian-Style or International-Style Pale Ale
Classic Saison
Experimental Beer
Belgian-Style Witbier
American-Style Brown Ale
Fruit Wheat Beer
Munich-Style Helles
Fruited Wood- and Barrel-Aged Sour Beer
Rye Beer
Irish-Style Red Ale
German-Style Maerzen
Double Red Ale
Scotch Ale
Belgian-Style Lambic or Sour Ale
Extra Special Bitter
Sweet Stout or Cream Stout
American-Belgo-Style Ale
Belgian-Style Strong Specialty Ale
Kellerbier or Zwickelbier
English-Style Summer Ale
Vienna-Style Lager
American-Style or International-Style Pilsener
Wood- and Barrel-Aged Beer
American-Style Cream Ale
Mixed-Culture Brett Beer
Smoke Beer
Honey Beer
Wood- and Barrel-Aged Sour Beer
Belgian-Style Dubbel or Quadrupel
Bohemian-Style Pilsener
Imperial Red Ale
American-Style Black Ale
Belgian-Style Blonde Ale or Pale Ale
Belgian-Style Fruit Beer
Brown Porter
Oatmeal Stout
Barley Wine-Style Ale
German-Style Altbier
American-Style Stout
Specialty Beer
Brett Beer
Session Beer
English-Style Brown Ale
German-Style Schwarzbier
Chocolate Beer
Dortmunder or German-Style Oktoberfest
Other Strong Beer
Scottish-Style Ale
Fresh or Wet Hop Ale
English-Style Mild Ale
English-Style India Pale Ale
Export Stout
Historical Beer
Baltic-Style Porter
Classic Irish-Style Dry Stout
Aged Beer
Ordinary or Special Bitter
Pumpkin Spice Beer
Classic English-Style Pale Ale
European-Style Dark Lager/Munich-Style Dunkel
Old Ale or Strong Ale
American-Style Wheat Beer
Gluten-Free Beer
Bock
American-Style Lager or Ice Lager or Malt Liquor
German-Style Wheat Ale
American-Style Wheat Beer With Yeast
Other Belgian-Style Ale
German-Style Doppelbock or Eisbock
Belgian- and French-Style Ale
American-Style Light Lager or German-Style Light Lager
Pumpkin/Squash Beer