I saw "Project Fi" on there too. I would expect since that's just an MVNO for T-Mobile+Sprint you might be able to use it on their networks too.

Exclusive for a contract. Outright on the google store is an option.

This line from their product announcement page indicates that even though they're teaming up to have the phone available in Verizon stores, they're also selling unlocked directly from the Google Play store:

> We’re also offering Pixel unlocked on the Google Store and, for you Project Fi fans out there, you'll be happy to know that Pixel is the latest device to work on the Fi network.

Verizon Exclusive only in the US - they're selling it directly in other countries.

If it's being sold by Verizon it's factory unlocked anyways.