UGGGGGHHHHNNNNNHHHHHH!!!! (Sigh.) Here's the story from TV Line:

[The Simpsons] has tapped Fred Armisen and Carrie Brownstein — the stars of IFC’s Portland-influenced comedy series — to lend their voices to an episode set to air next fall (during the show’s 24th season).

The duo will play part of a “cool” family that moves from Portland to Springfield and becomes the Simpsons’ new neighbors. Homer desperately tries to befriend them, but Marge is skeptical that being cool isn’t all it’s cracked up to be. The episode is called “The Day the Earth Stayed Cool.”

UGGGGGHHHHNNNNNHHHHHH!!!! Oh... wait, there's more.

Exec producer Al Jean deadpanned of Armisen and Brownstein’s casting, “They’re the best thing to come out of Portland since everything our show took out of Portland.”

Okay, that's kind of funny.