Trials HD, currently speeding toward a Q4 release. You'll find forty new professional stunt tracks in the "Big Thrills" pack, as well as ten user-created levels. Those lucky enough to have their level featured will be rewarded with "cash or prizes, as well as in-game credit."
Microsoft and RedLynx have set up a page with info on the user-created portion of the DLC. Those who submit the top three tracks will earn $5,000, $3,000 and $1,000, respectively. You see how lucrative games can be, mom? Do you see now?
We spoke with the folks at RedLynx about the DLC, but they could not offer us a definitive launch date or price yet. Instead, we learned that Big Thrills will include "three new achievements with 50 more gamer points available, bringing Trials HD and its two DLCs to a total of 300."