Kudos to Riot for not spoiling the tourney (this post does contain a minor spoiler though)
So I watched the third game (played awesomely by KOO), and I had to leave to help with some gardening. I came back, and had heard that the VOD part of the lolesports site is spoiler free. Took quite a few hours before games went live there, so I didn't log in to the LoL client, being certain the winner would be announced there.
It totally wasn't! It said "click to find out who won!" Very, very classy guys. Also, the VOD site definitely did not contain spoilers, not even a way to figure it out from unintentional interfacing (like maybe game 5 grayed out because it didn't happen).
Job well done, folks.