I'm pretty sure my Africans will not have dewlaps. I just looked at Metzer's site and their Africans are pretty dewlap-less. I am so bummed. Still love my geese- but bummed!
Did you purchase their Super Africans or the regular Africans? If you got the Super Africans they should get dewlaps, but if you got the regular Africans they will most likely not have any sort of dewlap.
Still love my Chuck and Sarah but think I won't be letting them breed. I'll buy her some hatching eggs when we are ready to let them increase their family. 
