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It opens on a train carriage with Joaquin Phoenix as failed stand-up comedian Arthur Fleck, staring bleakly out of the window. Before long he's innocently pulling daft faces at a child on the seat in front, who laughs in response before his mother irritably responds: "Will you please stop bothering my kid?" We're already learning a little about his feelings of isolation and rejection here.
Next, a woman who appears to be some sort of counsellor tells him: "Arthur, I have some bad news for you. This is the last time we'll be meeting." Unimpressed, he replies: "You don't listen, do you? You just ask the same questions every week. How's your job? Are you having any negative thoughts? All I have are negative thoughts!" Oof.
While all this is going on, we see him rehearsing a coldly sinister laugh, getting very thoroughly duffed up and sitting despairingly beside a woman's hospital bed, before he spies a comedian on TV (played by Robert De Niro) cruelly mocking his stand-up routine, in what looks like a very 'last straw' type of scenario.
From then on, he starts to look a bit more like The Joker we know and love - the costume appears, that chilling grin is etched onto his face and there's a general sense of chaos about to unfurl. Basically it looks like it could be pretty great.
Some not-so-subtle hints towards a new trailer had surfaced earlier this week, when a series of several short clips were posted to the official Joker Instagram account.
The videos included short snippets of footage that hadn't cropped up in the first official trailer back in April, including a shot of The Joker dancing around on some steps in a red and orange suit, and another of him walking outside in the rain.
But while the videos didn't initially seem to give much away - given that each was so brief - eagle-eyed fans soon realised they actually bore a secret message.
It turned out the videos all had a different subliminal graphic that flashed up during the clip, which, when pieced together spelt out 'TRAILER 8.28'... Otherwise known as today's date.
The film is due to premiere at the Venice Film Festival, which kicked off today, before being released on 4 October.
It follows Arthur Fleck as he turns to a life of psychopathic crime after society rejects him - in turn transforming himself into The Joker to wreak havoc on Gotham City.
As well as Joaquin Phoenix and Bobby De Niro, the film also stars Deadpool 2's Zazie Beetz as Joker's love interest.
The first trailer was given its debut at Cinema Con, where director Phillips wasn't willing to give too much away.
In response to suggestions that the film isn't entirely accurate to the character's traditional backstory, he said: "That's what happens when you set out to make an origin story about a character who doesn't have an origin."
When asked what genre the movie fits into, he simply said: "It's a tragedy."
In a recent interview with Empire, Philips also explained how Joaquin Phoenix had always been the man for the role.
"I think he's the greatest actor," he said.
"We had a photo of him above our computer while we were writing. We constantly thought, 'God, imagine if Joaquin actually does this.'"
Philips continued: "We just wrote our own version of where a guy like Joker might come from. That's what was interesting to me. We're not even doing Joker, but the story of becoming Joker. It's about this man."
He added: "We didn't follow anything from the comic books, which people are gonna be mad about."
Joker is set to hit cinemas on 4 October.
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