Fantastic Beasts and Where to Find Them is doing well enough to ensure that we at least get a second film. I personally think they will all do well enough to ensure all five planned films get made.

Personally, I do not believe any of the sequels will be called "Fantastic Beasts and Where to Find Them". I believe that each film in the franchise will be titled after a different book from the series. I think these are the likely ones.

Quidditch Through the Ages
The Tales of Beedle the Bard
The Life and Lies of Albus Dumbledore
I cannot decide what the last one would be. Maybe Hogwarts a History or A History of Magic.

I'm pretty damn sure that we will see the unadapted backstories of Dumbledore and Voldemort from Half Blood Prince and Deathly Hallows at some point in the series.

They'd be really stupid not to, fans would love to see the Gaunts and Dumbledore's family.

I'm pretty sure as they show the destruction of Grindelwald, they will also show Voldemort's rise to power. It wouldn't surprise me if they showed Voldemort murdering his parents like he did in the first chapter of the fourth novel, but was regrettably left out of the Goblet of Fire film.

I do not believe that Newt will continue to be the main character of the franchise. He should appear in each film, but I believe each film will have a different protagonist, one of which will almost certainly be Dumbledore and young Voldemort.

I'm pretty sure we will see more of the Tales of Beedle the Bard on screen in the film titled after that book.

I also think Quidditch will play a big role in at least one of the films.

I don’t think [Newt will be at] the heart of all of them. I think he’ll be part — so will Tina, Queenie and Jacob — will be part of the next one. [Dumbledore and ] Credence and Grindelwald – I think they will be the main players.

Redmayne revealed a real answer:

You know, I did actually ask that question to David Yates and David Heyman yesterday. And the answer is “Fantastic Beasts” will remain in the title if we go forward, and then it’ll be “and the…”

So who should play Dumbledore? I see Ewan Mcgregor seems a favorite, although I would vote for Colin Firth. He looks a little like Gambon.

"I think" passes as a confirmation now? He doesn't know really because he's not the one doing the story and it has been confirmed before that the series will get to Dumbledore and Grindelwald eventually way before. Besides Fantastic Beasts really didn't play as a solo Newt Scamander movie, but rather an ensemble one - even though it's based on a "book" by Newt. Obviously they just took it as a starting point. He wasn't the one doing all the work and being main go-to hero as you would suppose. So the producer basically says it will be an ensemble movie and that's some big news? If you read my reply I say just the same:

"It has been confirmed this series is about Newt Scamander and later on it will concentrate on Dumbledore and Grindelwald's tale."

And he didn't spoil anything if you've seen the movie. What is up with people having the need to be told explicitly something in movies nowadays???

What in that scene made it obvious that he survived?