CBS has posted summaries for their upcoming season finales and The Amazing Race summary is interesting:
"SUNDAY, MAY 6
8:00-10:00 PM THE AMAZING RACE – After traveling five continents, 22 cities and nearly 40,000 miles, the series’ 20th installment concludes in a special two-hour season finale as the final four Teams race through Japan and onto Honolulu where one Team will win the $1 million prize. Hosted by Phil Keoghan. (Two Hours)"
It certainly seems that the final team will be eliminated in Japan. Not sure if this has been mentioned yet.