If it did have it would be just a number to slap on the box.
I don't see AT&T ever using hspa+, I think they are going to be moving over to a 4g network, before the current 7.2mbps becomes a problem. Don't hold me to this, it just seems like what I have heard.
My iPhone 3GS has never seen a 7.2 mbps speed, Even if AT&T says all towers are now upgraded to the speed.
My 3g speed maxes out at 1.8mbps at 3am, and average about 200kbps at 3pm.
So advertising such a speed is a joke.
The move from 3.6mbps 3G to 7.2mbps 3G made zero difference in speed for me.