Kathleen Turner (who played Chandler's father) has sparked rumours that there may be some Friends specials. Currently Warner Bros has denied there is anything to this.
And despite thinking the show is fantastic, I hope they are just rumours.
Friends is a fantastic series that never fails to make me laugh, no matter how many times it's rerun on E4. It had a fantastic ending. It generated many happy memories.
But the show has become such a legend it would be impossible to live up to it. Going back would almost certainly merely produce a disappointing memory. Let the show remain in our memories, let the character's futures remain in our imagination (and in Joey). Don't let it all end badly.