As far as the Archers (or any soap) is concerned, I always assume that whatever outcome will most complicate matters (i.e. provide more 'interesting' dramatic possibilites) is the most likely. Thus, I'd be willing to wager a large sum that the DNA tests will show Will's the Daddy -- 'cos if it's Ed's baby, that would make it far too easy for Ed & Emma to bugger off to France without nearly as much additional anguish, agonising & other juicy grist for the Archers' writers to sink their teeth into...