As with any comic book property, any adaptation is met with a degree of buzz. When the character in question happens to be the Clown Prince himself, then that buzz goes through the roof. That in itself has only increased since the performance and subsequent passing of Heath Ledger. Since Todd Phillips and Joaquin Phoenix jumped on board Joker, a lot of anticipation has been brewing.
From the off it was made pretty clear this exists outside the extended DC universe. There had been rumours, as is the internet wont, that Batfleck might appear, etc, etc. This is not going to be the next big comic book film though. What Phillips is going for has been fairly heavily influenced by Martin Scorsese. He’s admitted that in any case, it’s no grand secret.
This approach will undoubtedly alienate some.