It certainly looks like packages are scheduled to go out today - that lines up with the "12th-13th" estimate google gave me for ground shipping. Maybe they delay shipping for Expedited customers, though.

I don't have a trade in, so I only have the one package (and my Google store page says it's all arriving in one package). My FedEx account updated almost exactly the same time I got my email, so I got no advanced notice either.

I suspect you'll have to wait for Google to send you the "shipped" email in order to confirm your package is actually scheduled to be shipped.