I'm looking for the Lollipop OS that I can sideload to my Nexus 7 2012 and supposedly they released Lollipop for Nexus 7 2012 today (Nov 3, 2014). Is there a site I can go to download the OTA file?
The official version is not here yet.
The place you've already linked is where the downloads will show up first. Normally OTA updates are staged-rollout, meaning you'll have to wait until your device/region is eligible to receive the update unfortunately.