I made a quick update to the Soloer's Pre-Heroic Gear Guide today to include a bit of 4.2 information. The Chest of Forgetfulness is off. Those 2200 JPs are better spent on the Tier 11 chest. Pretty much all the changes I made are below. I still need to add the 4.2 Firelands grind currency options.
Just quickly, the Jal update: More Firelands grinding while waiting for LFG PUGs. I've gotten in Vortex Pinnacle and The Stonecore that I haven't run before. And after a bit of a sales war between three sellers of the Chestguard of Nature's Wrath(I canceled, dropped price, and relisted twice), I managed to clear 4090g on the AH. Picture above. Four more times and I can buy new bracers. ;^D
Smolderskull Bindings (4.2) -- Going for 20k-30k in chat; haven't seen in AH yet
As Lissanna says, and then there were bracers. The Smolderskull Bindings are new in 4.2, and are actually 1250 Valor Point items. But they're BoE. I think you're better served by saving Valor Points once you earn them for Tier 12 gear. And when you're pre-Heroic, you can't get Valor Points anyway. The price is so high I considered keeping these off, but some folk are so good crafting or have access via guilds or mains that it's good to keep them in mind.
Reputation: Hyjal (again)
Nightweaver's Amulet (4.2)
You've already run Hyjal and gotten good rep just with the quests. That bagged the Aessina Blessed Gloves I mentioned before. With 4.2, you can quickly pick up an ilvl 365 neck for under 90g if you've finished Hyjal and enter the Firelands. It takes a few more Marks of the World Tree to enter the Firelands proper, but it's a minor grind. There are more rewards for grinding Firelands that I'll be adding shortly, but they take 31+ days to unlock, which is insane. Tol Barad-like, but grindier.
Justice Points: (note that the full lists for each of these is in the full guide)
Stormrider's Regalia items
At the same time, note that you only get 140 Justice Points per normal Cata dungeon. Getting everything on this list means you're running 59 normal dungeons. That's a lot, obviously. And you don't need all of this gear to be geared for Heroic, which is a change with 4.2. You're easily overgeared, if only slightly. So let's get the Vestment and Cluster (still the best head pre-Heroic). Then if you've got a one-handed weapon, go with Apple-Bent Bough. If not, save for the Stormrider's Leggings. Why? Because when you go Heroic, you'll want the lower price Tier 12 Valor Point gloves first, I think. Honestly, if you've got the Furious Kilt from the AH or farming, you could potentially skip the legs here.
Ultimately it's up to you. Just know if you gloves for the T11 two-piece bonus that you might replace those pretty quickly once you're in Heroics.