I got the same email tonight except it says "your new 3GS".
Umm, I already have a 3GS.
I guess their system hasn't updated to the iPhone4 form letter.
For about 1/2 hour I actually thought I mistakenly ordered a 3GS in all the switching back and forth to get a phone ordered.
When I went online to check my order, all was well.
My only issue now is that mine seems to be shipping UPS.
Normally, I would prefer UPS but for this, Fed Ex = early UPS = Late.