Richard Joly at ONOWEB found this for us on the Crowded House mailing list:

Sean Lennon To Work With Neil Finn

Sean Lennon, son of the late Beatle John Lennon, today announced that he and former Crowded House frontman Neil Finn will be recording a song that the pair wrote last year in Australia. The collaboration will take place later this summer when Finn is in the United States promoting his forthcoming solo album, "Try Whistling This."

We'll add more information on this as it becomes available to us.