Like everything else in Romanov history, Rasputin's relationship with Alexandra has been ridiculously sensationalized. He rarely visited the palace and most certainly was not her lover. I really, really hope this sticks to the facts and doesn't fall into the sex and decadence, but it probably will.
The biggest thing about Razz was his huge, massive organ. Leo just isn't swinging that much pipe. A man who's packing 14" or more has a certain swagger. Even if we aren't going to see the one-eyed wonder (boo!), we've got to believe he's got it tucked away.
I'm only onboard if Daniel Day Lewis and Kate Winslet are Nicholas and Alexandra. (Yes I know what Kate as Alexandra could promote the idea of an affair between Alexandra and Rasputin but in my mind she is the only actress close to having the right skill set for the part.)