As predicted, there is a new era of twink gear out that is equivalent to Cataclysm's 77-80 market (which is still alive and kicking). Keep in mind that now is not a great time to sell, it's a great time to buy. Lots of this will be on AH's for relatively cheap, but now is not necessarily the best time to post these, except leather (for monks). Keep in mind that if you start posting at high prices will result in people undercutting you, ruining the potentially endless flow of great deals for the greens(and blues) on the AH.
If you're using TSM, there is only one search that you need to do:
These searches look for all items available to those in the range 80-84 with ilvl 364 and higher. This will include all weapons and armor that came out in MoP available to this bracket. There are 80-82 blues that are super OP, so keep an eye out for those, they're ilvl 409-425!
If you're using Auctionator you have to do 2 searches
And that's it! You may want to go through this gear and hand pick the ones with the best stats, but at the current prices I'm seeing, if it doesn't sell, you can DE it for a profit! Now is a great time to stock up on this to sell it throughout the expansion. Even with a little gold you can make a decent investment, and expect high returns once a majority of the characters are at max level and not questing in the 85-86 zones that drop these! Welcome to the new era of twink gear!
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