Wow I just wrote a massive write up on this and the website glitched out. I found a video that kind of answers your question on the Playoff.
In terms of the Conference title games, It is based on best conference records. So basically what it means for UW is that if they win next week, they play for the PAC12 title. If they lose, WSU plays for it. If there is a tie, head to head is the first tiebreaker, so that is why even if Ohio State wins next week, they will not play for the BIG 10 unless Penn State loses, because Penn State holds the head to head.