There are a lot of questions about how Fantastic Beasts and Where to Find Them will tie in with the Harry Potter main series despite taking place decades before. It seems we have a pretty direct one coming though.
It seems Albus Dumbledore will be turning up in the series later down the line. Speaking at a fan event (via The Independent), director David Yates said:
In the second movie Dumbledore comes back. He's got a couple of good scenes with Newt… We're discussing who would play Dumbledore, any suggestions would be good
Of course, Albus will likely have to be portrayed younger, but at the same time, it's expected that the character is around 150 years old. It's thought he was born in 1881, making him around 47 in the time Fantastic Beasts takes place. So we should be looking for someone in that range, I'd say.