Nokia has unveiled a rather mysterious Windows Phone teaser today. In a YouTube video, the company simply asks, Have you heard what’s coming? After some car revving the 15-second video goes on: See and hear what you’ve been missing, before it fades out to Nokia and Windows Phone logos. Nothing else is teased, and it’s not immediately clear what Nokia is planning to announce. However, Nokia has posted this particular teaser to its US YouTube account, suggesting this isn’t a worldwide announcement.