Apparently Elementary was at Comic Con, and the audience got to see the whole pilot. I wish I could have been there.
Then the actors and the writer Rob Doherty answered questions. Here's a summary at TVLine, and here's a liveblog version. This article is more in depth, and CBS posted video clips on their website. You have to click each video separately.
They say that the episodes will be new cases rather than adaptations of the canon. They'll also hold off on an appearance from Mycroft but make Holmes's father into a looming presence. I would prefer that they don't introduce Moriarty right away. Just wait for a few episodes, please? Like five or six. You've got 22 episodes to work with. Please don't rush it. There's plenty of other great villains like Charles Augustus Milverton, Grimesby Roylott, and John Clay. (Or do equivalents of them, given that you're not adapting the book cases.)
I hope it will be like the 1950s Ronald Howard series, where even though they made up plenty of original cases, the stories sometimes had echoes of the canon even still.