Winner of spring season plays winner of fall season in the Championship. Eugene have already booked their spot by winning the first half.
Now they're neck and neck with Vancouver for the second half title with 9-10 games left. If Eugene win this half too, then the pennant series will be against second overall (EDIT; second in the second half, I stand corrected)
Everett are a couple of games up in that spot and beat Eugene last night - Everett are in a weird spot of needing Eugene to win the second half of the season (to make second overall relevant), while currently in a series against them and needing those wins to hold onto second.
Watch this space!
As an aside, a High-A World Series would be cool if you could somehow take the 3 winners and put the 2 with the lowest winning percentage in a wild card, but I guess that would likely prolong the season way too long