Interesting how this seems to vary.
I ordered a 64G 6P Graphite via Project Fi at 8:45 PM on 9/29. When I go to wallet.google.com, it shows as as Pending with no additional data. When I go to the Play.google.com and look up orders, it shows as Preordered, with Nov 5 - 9 as the dates. Interestingly, the accessories I ordered as a separate order (cables, case and such) at 8:50 PM same day show as Pending 10/30 - 11/3. on the play.google.site.
The wallet site also shows a warranty Nexus 9 that has been shipped to me as Pending then it also says shipped, while play.google.com shows its status simply as shipped. Bring that uponly to show that the two ways to see status look a bit different and only the play site gives you the estimated delivery date. But both give you good dates once shipped.