UPDATE 3: It looks like for new Sprint Customers - you can not pre-order - It says the following:
At this time, we are only taking online iPhone orders for current Sprint customers upgrading a phone on an existing line. If you're a new customer, or simply want to add a new line to an existing account, please select this option and click "Continue".
There you'll see how and when an iPhone can be purchased at your local Apple Retail Store.
Which then takes you to this message:
In order to purchase iPhone with a new Sprint account, or to add a line to an existing account, please visit an Apple Retail Store.
So at least for those jumping to Sprint from another carrier or Adding a line - no Pre-Order for you. Walkins only.
UPDATE 2: Pre-Ordering is now live - Go HERE
Update 1: Engadget is reporting on a 3:00 AM ET launch for pre-ordering. I will stay up and see if this comes to pass.
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Sometime between 2:00 AM ET and probably 9:00 AM ET the iPhone 4S will be available to pre-order.
When it is available I will send out a push with the URL to pre-order and also update this post.
Here are two links from the iPhone Pre-Order in June 2010:
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If you will want to pre-order for delivery to your house you will need to go here - http://store.apple.com/
If you want to reserve an iPhone 4 for pickup at your apple store you will need to go here - http://store.apple.com/us/go/iphone4
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If the past is any indication it likely will be around sunrise on the East coast.
Again this post will be updated as soon as I have more info.