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About pre-ordering or buying in general.

I'm in the same situation as you guys, but what concerns me more than the JB is the ease of buying that phone.

I read this on the Apple Store FAQs :

Can I buy an iPhone without an AT&T contract?

No. iPhone requires a two-year AT&T wireless service contract.

Source

Now I don't know if it will be easy to buy without an AT&T contract, I hope someone can clear this up.

I hope it won't be difficult at BestBuy or RadioShack or some other store.
Need more infos on this.
 
Currently to unlock the 3GS, it requires a baseband downgrade. It's currently not compatible with iPhone 4. It will probably be at least August before they can come up with a way.
 
Currently to unlock the 3GS, it requires a baseband downgrade. It's currently not compatible with iPhone 4. It will probably be at least August before they can come up with a way.

It won't be August before they come out with a way. They have an UL for the latest baseband and they've had it for a while. They held off on releasing it so Apple couldn't patch the exploit prior to the release of iPhone 4.

Unless Apple miraculously patches the exploit there will be a JB and UL within 24 hours of the iPhone 4 launch.
 
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