The Challenge part of the equation will be the online race against Scott Dixon, wherein you try to beat the IndyCar driver's time around a track in a 2013 Civic Si for the chance to meet the racer in person. What's more, Horizon players will get to choose the track – look for the Honda section in Xbox Live and place your vote by January 8 for the showdown venue. There's also a photo contest that starts on January 15, the same day that the absolutely free challenge pack will be available. The winner of that contest will get custom-wrapped Civic Si Xbox 360 console.
While you wait for that, available as of yesterday is the rally expansion pack. It adds five rally cars, new multiplayer events, co-drivers making announcements and a seven-race series in Colorado with 20 stages that culminates in someone being declared rally champion. If you want in, it's free if you bought the $50 Season Pass – and you'll also get a 2003 Ford Focus SVT as a special bonus – or it'll be 1,600 MS Points if you aren't a member of the Season Pass club. We're working on a review of the significant expansion, too, so stay tuned.
The video below takes you on a romp through the rally pack, with ample demonstration of all the crashes you can't wait to have.