New
#21
Yes, they provide official hash values with the downloads so you can know if you've downloaded correctly. Theoretically possible for them to still have something different end up on shelves in the fall, but unlikely.
If they're smart they'll put things up around midnight (tonight) Redmond time while it's still the middle of the night for all the U.S. That way they can maximize how downloads are spread out... hopefully. Suppose the next best option would be the mid to late evening on the 6th for similar reasons.
They've known for a good while that the 6th is their target date. I'd hope they don't have any unusual delays.