After much ado about the still art and set photos, the first official trailer for Sam Raimi's 'Oz The Great and Powerful' has arrived. I like how the trailer starts blocked and in black and white before hitting the colorful world of OZ and expanding wide. That's a nice callback to 'The Wizard of Oz.' It looks beautiful, I just hope all the fantastical elements don't overwhelm the story. Take a lo…