PlayItAgain isn't really breaking news here--it was announced in Patrick Healy's NY Times article last week:
The fourth Apple play, which he has not started writing, will be set against the 50th anniversary of the Kennedy assassination on Nov. 22, 2013. Mr. Nelson, who lives and works in Rhinebeck, is also directing the plays, and the same five actors have been in all the productions so far. (A sixth character, the boyfriend of one of the siblings, was cut from “Sorry” because the actor had a scheduling conflict.) Link here
"You travel alone because other people are only there to remind you how much that hook hurts that we all bit down on. Wait for that one day we can bite free and get back out there in space where we belong, sail back over water, over skies, into space, the hook finally out of our mouths and we wander back out there in space spawning to other planets never to return hurrah to earth and we'll look back and can't even see these lives here anymore. Only the taste of blood to remind us we ever existed. The earth is small. We're gone. We're dead. We're safe."
-John Guare, Landscape of the Body