A:AnswerAccording to Google, translation will only work "with the assistance of the Google Translate app on your Google Pixel or Pixel 2 phone". I take this to mean that it will not work with Nexus phones.
A:AnswerThis product is not yet released. According to the item's page on BestBuy.com, the release date for the Pixel Buds has not yet been announced so wait time cannot be determined right now.
A:AnswerIt will work with any phone with bluetooth function just like any other bluetooth headphones. The killer for pixel buds is Google assistant which only works with Pixel phones so if you want to use that, you need to have pixel phone. But being premium headset, it gives you best sound quality with any other phone.