We already imported the items, the only problem is that all of the item names are the same, 'Cata/MoP item'.
Step 1: Download Patch-E.MPQ from How To Connect page.
Step 2: Paste it in your Data folder where Patch-8.MPQ is located. Do not delete Patch-8.MPQ! Keep both.
Step 3: If you want to Transmog any of the items, here's the item list we added, and you can ask for any new (Cata/MoP) item from Mazino's item requester.
Step 4: You obviously want to konw what you're transmogrifying, the only way to know that is to paste the id of the item to the end of the link after item=
For example: http://www.wowhead.com/item=89347
Search for an item ID from this list we've added: ITEM ID LIST
Open items_mop_cata_content_update1.html with your browser if you want to see the list of new items.
The patch might create some issues. Don't hesitate to post them on the forums so we can fix it ASAP!