In the promo you can see Uchenna struggling with the ROADBLOCK (Throwing axes or something at a target) and it is dark out. So the Roadblock is running late. TPTB are trying to show that the Uchenna and Joyce team, marked for elimination, is running late (but I think everyone is running late according to the info we have about changing the pit stop).
It looks like everyone is running late and the teams won't be able to catch some flight which would take them to the pit stop, so TPTB have changed it back to some non-descript open field.
All of this seems to indicate that there is NO FAST FORWARD in this ep. If there were a FF, then the team might have already made the flight to the pit stop.
AH, perhaps Eric and Dee took the FF and are on the plane to the pit stop, but then TPTB get the word back to the airline people to kick E and D off the plane since they have now decided to change the pit stop location.
Another possibility is that E and D were boarded onto the plane in a "stand by" capacity meaning that they would have to give up their seats (actually four seats) if the party holding tickets showed up at the gate.
Ah, sweet mysteries of life on TAR