"Ghostbusters 3" Casting Rumors!

So, we know that Bill Murray, Dan Akroyd, Harold Ramis, Ernie Hudson and Sigourney Weaver all returning for the new sequel, which begins filming next year. And we know that the film will have a new generation of Ghostbusters battling it out with ghosts.
SO! Casting has began on who will fill the roles of the "new generation" of Ghostbusters who will (I guess) take over and come back for sequels, if the third film is successfull enough.
At first, Ben Stiller was set to be a new Ghostbuster, but now he aint. Next was Seth Rogen. I would fucking love to see him play a Ghostbuster. But he aint as well. But rumors have began, saying that Bill Hader, Anna Faris and Will Forte are all attached to the film, possibly as Ghostbusters, maybe not. But I'm sure we'll find out soon, if filming is deffo the beginning of next year.