It seems Fast Track has moved to Security East. This involves an even longer walk than it already was you turn left after security and so have to then double back on yourself to walk to the A gates.
You can however see through to a part of the new UK arrivals area they are building. It looks like it might be a bus drop off, followed by trekking UP to security level (possibly to facilitate transfer pax joining the flow after security east) and then presumably back down again to arrivals level. Let’s hope they’ve decided to install escalators….