I am excited to see Carey Mulligan
in pretty much anything, and judging from the trailer I think she'll be perfect in this. I'm still not sure how I feel about Leo—could be great, could be weird—but Tobey Mcguire is pretty much never a good casting choice in my book. As other posters have pointed out, he's got this dopey, wide-eyed "DURR I'M IN A FILM" look on his face all the time.
Then again, that might work for Nick. We shall see.
And then there's the director. Baz Luhrmann intrigues me in a train-wreck sort of way—loud, flashy, hectic, full of smash-cuts and what-the-sweet-hell-is-going-on. I kind of loved his Romeo and Juliet
adaptation mainly because of how balls-to-the-wall audacious it was—every choice he made was calculated and far-too-clever-for-its-own-good but it just WORKED. The theatre scholar in me wanted to scream but I couldn't help but sneakily like it. (I couldn't stand Moulin Rouge!
though—somehow my disgusted fascination turned to pure loathing pretty much instantly.)
On the other (third?) hand, Luhrmann's signature style of loud-flash-hectic seems like it works for this story. WE SHALL SEE.