Trainspotting 2 seems to be finally shaping up; here's what we know so far, courtesy of the director and cast members.

The movie is bringing back original pack Ewan McGregor, Jonny Lee Miller, Robert Carlyle and Ewen Bremmer--even though some of the cast members had expressed concerns at first. In an interview with Vulture, Boyle revealed how things started out a bit sticky.

"The actors were very fearful about a sequel as well!" Boyle said. "Actors are a great barometer of whether something is worthwhile or not. Their bullshit filter is very, very strong, because they're going to be the ones out there trying to make a script look truthful and believable. When it comes to doing another Trainspotting, they were very nervous, because for all of them, it's a large part of their reputation and they feel very protective towards their character."

Most recently, Carlyle confirmed that he will be back forTrainspotting 2 as Begbie, and talked about the movie for the first time.

In an interview with NME, Carlyle revealed that he had read the script and gushed about how great it was.

"We've already had a read-through of the script, we did that in the springtime," Carlyle said. "You're going to think, 'Of course he's going to say this,' but honestly, it's one of the best scripts I've f--king read. I mean, ever. What [screenwriter] John Hodge has done is just so clever," he said.

Carlyle went on to dish about the direction the movie is taking without revealing spoilers.

"Well, obviously these four characters are 20 years older now and I've never seen a sequel that takes place 20 years after the original, so I think that gives it a certain unique quality. And of course, the audience is 20 years older too--people who came to see the original film when they were in their early twenties are very different people now," he said.

He elaborated some more about writer John Hodge and director Danny Boyle's collaboration on the film and what they have envisioned.

"The way John Hodge has put this thing down, obviously with the help of Danny Boyle, is to make it about how the characters' lives have moved on... or have they? Without giving anything away, maybe some of them haven't really moved on." Carlyle said. "That's what the audience is going to have to go through with them. I tell you, this film is going to be quite emotional for people because the film sort of tells you to think about yourself. You are going to be thinking: 'F--k. What have I done with my life?'"

Boyle also spoke about the film in a previous interview with The Hollywood Reporter while promoting his latest film Steve Jobs. The director revealed that principal photography for the sequel is expected to begin in May or June of next year. The schedule has been worked out keeping in mind the other commitments of the core members of the original cast, who are set to return. Boyle did add that to make this happen, they might have to work with a very tight schedule and wrap filming quickly.

"They only get this little window off, so either you wait for the contract to run down, which could be as late as three years, or you kind of try and do it in this window," he said. "But all four lads are back in."

The director also spoke about the budget of the film and how it will in someway similar to how the original was made (with just $2 million).

"We're doing it for less than $20 million, and that'll give us control of the film so we can make the film we want to make," he said. "That's as much as you can get without being answerable to anybody. You can sort of get on with it without much interference. Although we could have raised a lot more money for this, we didn't, so we're trying to keep some sense like we kept the original."