It constantly amazes me how such a simple villain with no super powers can keep coming back with a fresh appearance, albeit mind-boggling. The Joker's character has evolved so much over the course of my lifetime, from the original Batman cartoon to the Nolan Trilogy to the more recent The Dark Knight Returns Part 2 animated film, that his portrayals are endlessly satisfying.
As an aside, the same can be said for Batman himself, who despite being an ordinary man in a cape and cowl is shown as cunning and resourceful to all ends.
Even so, while this new Joker certainly possesses some fascinating quirks, I am reserved until I'm able to see him act out his role on the big screen. In my mind, approaching an already well-established character in such an unnatural manner will either make or break the interest of the viewership. Although admittedly, this could be held to my discredit of never seeing much of Jared Leto, so in addition I'm undecided on his proficiency as an actor.