Ask Ausiello posted a small bit about Cougar Town on their blog

Question: I can’t wait for Cougar Town. Do you have an spoilers? –Becca
Ausiello: Courteney Cox’s old Friends will definitely be paying her a visit. “You and I both know that we’ll do that eventually,” concedes exec producer Bill Lawrence of a visit from Aniston, Kudrow, Perry, Schwimmer, or LeBlanc. “But right now [ABC] is marketing and selling Courteney, not the [possible] guest stars.”