Nice possibilities Gingerman but as much as I force myself to think that there is a chance that the Teams will stop by at London before heading to South Africa, its just not happening for me because thats a lot of traveling for one leg. I see them visiting London later on.
Phil has been dropping a lot of hints in his interview regarding this race. He said that the teams hated the new NEL twist they had for them and that there will be suprises with the mileage of this season's race. So now I'm thinking more of, Starting Line-> South America-> South Africa/Botswana-> India-> Oriental Country-> Turkey-> London-> Jamaica-> Puerto Rico to Finish Line.
Anyways, about tomorrow's two hour episode. This is what I think will happen... (pure speculation)
-Rob and Amber depart from the Polo Club in First place (around midnight)
-Clue tells them to go to a Landmark/Famous Area in Tigre or nearby place
-Place is close until the departure time of the last team
-Last team departs (Merideth and Gretchen, around 9-10 am), Landmark/Famous Area opens for the waiting teams there
-Clue tells them to travel by train to Buenos Aires and book flights to Johannesburg, South Africa in Ezeiza International Airport. Once there, travel to Gold Reef city
-The teams head to Buenos Aires all in the same train
-Merideth and Gretchen reaches the Landmark/Famous Area in last place and jumps in a train to Buenos Aires
-The teams book tickets in the fastest flight to Jo'burg, everyone gets on the same flight and wonders if Merideth and Gretchen could make it
-Merideth adn Gretchen misses the flight by minutes and gets a later flight that is behind but not more than thirty minutes
-Teams arrive in Jo-Burg, gets their clue somewhere and, go figure, here is the first Fast Forward of the race
-First team (Ray and Deana) to reach the cluebox chooses to attempt the Fast Forward
Another team that arrives at the cluebox later doesn't know that someone else decided to go for it
-The two teams going for the Fast Forward heads to the Cooling Tower in Soweto while the other teams head for Gold Reef City for the Roadblock
-Merideth and Gretchen arrives and heads to the Roadblock
-Ray and Deana arrives at the Cooling Tower first and starts the Fast Forward, second team arrives at the Cooling Tower (probably Ron and Kelly)
-Other teams reach Gold Reef city and starts on the Cave/Mine Roadblock
-Teams finish the Roadblock and heads to another place for the detour
-Ron and Kelly are forced to return to the Roadblock area because Ray and Deana got the Fast Forward before them
-Ray and Deana heads to the Pit Stop and "clocks in"
-Merideth and Gretchen arrives at the Roadblock area, Gretchen decides to do the Roadblock
-Ron and Kelly arrives at the Roadblock area, Kelly chooses to do it
-Gretchen finishes the Roadblock and is returning
-Gretchen: Merideth!
-Merideth: Come this way!
-Gretchen falls down and injures herself while returning, Kelly hears this and reacts
-Merideth who is waiting somewhere in the safer part of the cave/mine heads in and sees Gretchen crawling out of hole (freaky)
-Gretchen is rescued, everything is fine but she needs to get a facelift first, oh I mean, her wound needs to get cleaned and covered up
-Kelly finishes the Roadblock and leaves for the Detour
-Other teams start finishing the Detour and starts heading to the Pit Stop to "clock in"
-Merideth and Gretchen lost time but starts to make their way to the Detour
-Ron and Kelly arrive at the Detour Area
-Merideth and Gretchen arrives at the Detour Area
-Ron and Kelly finishes and clocks in
-Merideth and Gretchen finishes and is greeted by another weird local
-There are saved by a non-elimination, Gretchen pulls out that loud moan: Ohhhhhhhhhhhhhh!, that I have fallen in love with
-Phil introduces the new twist
the end of leg 5...

Blah blah blah.. sorry about my pointless post. What probably adds to the reason why they compiled both legs into one episode is because of that new twist. To properly introduce it to the viewers. Well whatever, I'm done talking.