There may already be a thread about it floating around somewhere in here due to how old the trailer is but yeah it looks great. I can't believe they are cutting it into 3 movies though... it is like there is finally going to be a single book made into a movie that won't end up with something cut from it.
Also, ironically, I just started reading the book yesterday, already 100 pages in.
And my sister can't get over the fact that Martin Freeman and Benedict Cumberbatch are in it together
(in case you did not know they played Doctor Watson and Sherlock Holmes in the BBC Sherlock miniseries)