Cuddy wanting a child was first brought up in Season 2; I can't remember if it was again in Seasons 3 or 4.
Good episode. I liked that the lesbian angle wasn't just some cheap titillation but actually had dramatic impact. The Foreman/Chase conversation brought back fond memories of when they were working together on House's team. And it was funny! Also funny was Wilson and House; he really is back.
Now... sit back and wait to see who adds "Another life saved by girl-on-girl action" to their sig first.