Several people noticed a "Promoted Trend" at the bottom of trending topics list on Twitter, and it's there regardless of whether you're looking at global or local trending topics.
A Twitter spokesperson pointed to FAQs on Promoted Tweets, which say: "Like Trending Topics, Promoted Trends are already trending on Twitter but haven't yet made their way into the Trending Topics list. Promoted Trends are clearly marked as "Promoted." If a topic isn't already being talked about on Twitter, it cannot be a Promoted Trend."
When you click through you go to stream of tweets about Toy Story 3. Promoted Tweet appears at the top of page followed by others discussing movie. The ad seems to have been retweeted, probably because of its novelty, more than 100 times.
If you click on "promoted by Disney-Pixar" yellow button it takes you to Promoted Tweets FAQs. If you click on Disneyticketstogether.com link it goes to Facebook site where Disney is selling tickets to showings of Toy Story 3.
This's going to be a very effective social media promotion for Pixar — there'll be lots of coverage and discussion — even though the film already has huge visibility.