It's been a year of upheaval at YouTube. In October, the site unveiled a long-awaited redesign meant to expand (and improve) its selection of videos in order to get users to spend more time watching them. Now, YouTube is shifting its focus to advertisers. Lucas Watson, who started as YouTube’s vp of sales and marketing six months ago, hopes that 2012 will be the year big brands start to look at the site as a premium advertising outlet. Adweek caught up with Watson to talk about how he intends to do that.