The calendar is out for 2012!
January-March: Gas, Museums, Movies (cap $1500)
April-June: Restaurants and Movies (cap $1500)
July-September: Gas, Movies, Theme Parks (*)
October-December: Department Stores, Electronics Stores, Toy Stores (*)
(*) = no cap announced yet, likely to be similar.
My guess is there's no one-month category because they've upped the cap so much.