My dealer got back to me and I've set up an appointment for another attempt at fixing the leak.
Kia Tech support is having the dealer repair the leak again - this time they're having the dealer use Loctite 5900H sealant. Apparently the Loctite product has the same properties as the Permatex "Right Stuff" (ie high pressure resistance). The dealer is planning on keeping the car for a day or two; they want to drain the engine as completely as possible and really allow the sealant to cure before refilling the oil pan.
My dealer is familiar with "The Right Stuff" sealant and was actually considering using it, but neither they nor I want to set up any potential warranty hassles. In case anyone is interested, here's a technical PDF for the Loctite sealant:
http://www.rshughes.com/images/produ...WxTnQdHZsw.pdf
I'll be sure to let you guys know if this stuff solves the problem.
EDIT: I'm going to mention the possibility of over-pressurization in the sump. When I look again at the picture I posted, the spattering on surrounding parts looks like the oil has lightly sprayed from the joint (or somewhere around there).