I've just come through. Check in agent advised going back to South security and the guy dealing with Fast Track there recommended shifting left to the usual lines. No real queue at all - through in a couple of minutes. So unless you are one of those who thinks your eligibility for the First Wing means you must use it at all costs, there is no real problem right now (apart from having to be near ordinary people, of course, for those who find this idea horrifying...).