This morning my first task was to work on Engineering, since I spent the first night of the patch doing Alchemy and Jewelcrafting. First my Engineer needed to learn the new recipes, then make a Wormhole Generator. Once that was done, I immediately portalled myself to Ulduar to try farming the Jeeves recipe.
I arrived in the late morning, although it was closer to lunchtime on my server. There were already a handful of people there, killing the mobs and likely doing the same thing I was. At first I had trouble finding a workable spot, but I'm a patient little booger. I just parked myself on a little perch and waited. Eventually I was able to carve out a section for myself on the upper ledge by the Scrapbot dude.
The most annoying thing about this farm is that other Engineers stalked me and I'm guessing tried to skin my kills. The Jeeves recipe isn't looted, you need to skin it from the mechanicals. And for whatever reason, they didn't think I was there for the recipe. Either that or they wanted to ninja me, I have no idea. But being a small person, having other players flap their Netherray or Bronze Drake on your head is kind of annoying. So be aware that other people might get aggressive with you during these early days. Mostly I just ignored them and there was no trouble.
I got the recipe after about 40 kills, but it might have been closer to 50. I kind of upset another dude who was there farming, he claims to have spent 2 hours in the same spot with no drop. From reading comments on WoWHead, this drop rate looks pretty random. You could get it the first kill or the 500th.
Also, it looks like the Armory is already updated with 3.2 information and they are showing Jeeves as dropping from the Borean Tundra mobs. You may recall that on the PTR I tried farming there but had no luck. In this case it really was just bad luck, so if you want to give Borean Tundra a shot then go for it.
Now I'm collecting mats to make myself one, I actually didn't put much effort into this ahead of time. For you engineers who've never gotten some of the older recipes from Vanilla WoW or Burning Crusade, you may get frustrated with this project. The older recipes you need include all three Repair Bot Schematics (Scrapbot, 110G and 74A) and the various parts to make them. You also need two of the new epic gems (King's Amber) and 8 Titansteel Bars. Jeeves sure is epic, isn't he? You may have to farm the older recipes if you don't know any other Engineers with them, I wouldn't expect this kind of stuff to pop up on the auction all that often. This is looking like a pretty big project, so good luck out there!
FYI: Crafter's Tome has been updated with almost all of the 3.2 recipes (still missing dungeon/raid drops) and the Jeeves information is also available.