Details here.  The article reports she will remain on the Stanford faculty, though one would imagine the kind of practice she is charged with building will cut substantially into her classroom time.  Stanford will need to make some constitutional law appointments soon!

UPDATE:  A faculty member at Stanford writes:  "You’re 100% right we need to make some additional appointments in con law, and we have a number of visiting and permanent offers out there already, and a number of past visitors who are under consideration.   But this is also the first time [in recent years] that
we have three sixty person sections of Con Law I that are all being taught
by permanent faculty members — [Dean] Larry Kramer, Larry Lessig, and Pam Karlan.  (In recent years, we’ve had one of the sections taught by a visitor, except for the one year we had two ninety-person sections instead.)  And
notwithstanding Kathleen’s new association with Quinn Emmanuel, her classroom hours will actually increase (once her sabbatical is over) because she’s not deaning.  My guess, for what it’s worth, is that she’ll pretty regularly be teaching both Con Law I and Con Law II, a combination that she did only once in the last six years."