We will certainly see Sauron in the show, mostly in the shape of Annatar. I'm sure that either Benedict Cumberbatch or Tom Hiddleston would be great in the role though I doubt either of them would be available.
I first read that as
"We will certainly see Sauron in the snow,"
That would be amusing.
I think a good choice for Sauron could also be Daniel Sharman (the man who plays Lorenzo in Medici of anyone has seen it) he’s got a good way of making his character seem innocent in intentions while having ulterior motives.