It depends on how many they get done. They've already explained that their philosophy is to try to get as many as possible done before launch. I'm assuming they're working on the characters in twos (for rivals), meaning that if they can finish 6 sets of 2 (and keep them balanced) before it goes gold - which will be around a week before launch - then we'll get 12 more. If they can get more, then there will be more. We don't know how long it takes for them to make one character, so I can't give an accurate prediction. We know we'll get more than 20, so anywhere above 22 is my guess.