IMO the best way to predict the most likely metal on a particular route is to check what equipment has historically flown that route as the info on ek.com's "Services by Flight" are only indicative. This seems to be a good source for this data:

http://data.flight24.com/flights/ek5/

You can then cross reference the aircraft against Emirates777's excellent information here:

http://www.flyertalk.com/forum/emira...-emirates.html

FYI - In last two weeks, EK005 has been operated by a B777-300 with lie-flats, except of 6th April (B777-300ER with lie-flats), and 4th April when A6-EBJ was deployed with the dreaded "Deep Reclining Comfort" in J. Pretty good odds if past performance is anything to go by!