Since this is new I'm not entirely sure what each of the courses entail. I am guessing that the easy course is mainly on the double track / main trails (yellow course) with little to no difficulty (eg, switchbacks, hills, creek crossings, etc.) but the longest of the courses. I imagine the hard to be on the singletrack trails (maybe the 3 ravines?) but shorter (maybe 5k?) and the medium to be somewhere in the middle (out n back trail?). I'll see if I can't inquire at U. Sole to see if they know any more.
I saw somewhere that you get a Red Bull beanie hat which covers most if not all of the cost of the $25 entry. And if this is anything like the other U. Sole fall trail runs there will be a slew of free good food and beer at the end.
Oh, and Vcook gets a shout out for having done one of these in years past!