So here's the latest and greatest information pertaining to the updated (although PTR info) professions. Wowhead has the goods if you want to get a bit farther into what you can make and what the current materials are. Just be aware that there will be changes, but this at least gives you a good start on what to stockpile (if you aren't already).
*Edit- Brian stated in comments that these are all available from the vendors using honor points. What is changing is that they will become craftable in 4.2.0 as well as go from a i352 to a i358 and drop the "gladiator" from the title.
Now some folks are already predicting that the recipies will only be drops from raids/etc in Firelands, but I am not a believer of this. These will be added to the trainers like every other "mass" set of gear that is out there. No reason for blizzard to drop blue recipies for a whole "tier" of gear in instances, so if you are the stockpiling type, and you have a "crafting" profession, getcha mats ready for when 4.2.0 goes live.
Thanks to HWoodlockheart on Twitter, as Kaliope has a similar post as seen on PTR- Kaliope, fix your RSS so I can add you to my blogroll! Jeez!