Will Kate Middleton have a c-section or a natural birth?
Will she welcome a boy or a girl? With what color hair?
When will he/she arrive? And what will the name be?
For royal watchers - and gamblers - worldwide, there's a lot riding on these questions, as sports books say they've seen a surge in action since December.
"The second we found out that she was with child," in December 2012, said Rupert Adams of William Hill, one of the largest bookmakers in the U.K.