Here is what we know from CBS...
"Another One Bites the Dust "--In this Road Block,Logan/Redmond/Vanck/Brooke/Joey/Becca/Michael must construct a ladle strainer out of a piece off sheet metal. Once the foreman approves of the work, s/he will receive the next clue on THE AMAZING RACE.
At the Detour Decision Point, racersmust choose between "Lock" and "Knock" on THE AMAZING RACE.
"Another One Bites the Dust "--In Detour A, Floyd/Becca, London/Logan, Scott/Brooke must search hundreds of chests for hidden compartments for a key. Once they find the key, they can unlock the chest containing the next clue on THE AMAZING RACE
"Another One Bites the Dust "--In Detour B, Sara/Shamir, also shown!Scott/Brooke,Joey/Tara must knock on the three remaining "Royal Doors" and collect pieces of a woodcarving. Once all of the pieces are collected, they must bring them to a shopkeeper in order to receive the next clue on THE AMAZING RACE.
"Another One Bites the Dust "--After successfully completing the Road Block,racers make their way to the Pit Stop.