Checkout Tom911's recent post of menus for JFK-LHR-ORD in J here:
http://www.flyertalk.com/forum/showthread.php?t=528695
F meals will be similar to J with a few enhancements. Service wise, the meals will be served on the flagship china, not pre-plated, and the service will be far more individualized than J. Heading eastbound there will be a smoked salmon appetizer cart and a separate salad card that should include the choice of lobster tails. Dessert will be a choice of either an ice cream sundae or one additional choice (likely a fruit based dish) AND the cheese plate (I believe J only gets dessert OR cheese). Breakfast will be larger and should include a cooked dish (although I believe that cooked-to-order eggs have been discontinued in the last year). Wine lists will be roughly the same with perhaps a slightly better Champagne in F (sadly, Belle-Eqoque is now only available on the CDG routes). Certainly no Blue Label (or any real top-shelf drinks for that matter), but drink choices should include: Glenlivet Single Malt, Dewar's White Label, Crown Royal, and Courvoisier VSOP, among others.
Hope this helps and enjoy your trip.
-FlyerBeek