Gearing, most people around here use something between a 32-20 to 34-20, some use 34-18 (with 195 mm cranks).
I am not sure of the elevation gain per lap. Last year I think it was ~1100-1200 ft/lap. There are some minor changes to the course this year. Shiggy rode it last week and will probably weigh in here soon with details.
The base elevation at Willamette Pass is 5060 ft.
It's not highly technical, just a couple sections here and there.
Suspension will be welcome later in the day since the trails develop braking bumps during the conduct of the race.
Bring lots of really good dark beer and I'll be your friend
(reason for edits: not enough coffee yet)
What the elevation gain per lap, how technical, will I want suspension, what's the elevation of the course, how much beer should I bring?