Anne, I've only skied Nine Mile and don't recall the 18K ski loop was very hilly. I have neither biked nor run there, so I have no idea what the singletrack has in store for us. The run route will probably follow one of the bike courses pretty closely. A map can be had at wors.org.
There's a long string on the WORS messageboard about there being more or less ski trail than singletrack on the MTB courses this year. A lot of it is contradictory, however, and hard to translate for the running set.
But Cassie Gran, the trail run series director, posted this on the messageboard at trailrun.wors.org: “This course is extremely runner friendly for runners of every skill level. Whether your (sic) out to enjoy some great trail with good friends or want to push for a personal best this course works.”
If that's true, it can't be too hilly, can it?