If N94 is world phone, why are there 3 versions of iPhone 4 identifier in itunes? 4,1 4,2 and 4,3?

If N94 is world phone, why are there 3 versions of iPhone 4 identifier in itunes? 4,1 4,2 and 4,3?
Having handled larger screen phones, I guarantee there is a benefit
There is no reference to 4,1 4,2 and 4,3. Just the older phones and 4,1 .
I'll go with REPROVADO!
Don't let the door hit you on the way out.
Why would this be Cook's fault? He's only been at the helm for what, a month, out of the 16 or so that have passed since the 4's debut. All final decisions about whatever shows up on Tuesday were Jobs' alone. Make no mistake.
Noone has been able to explain exactly how Apple would do this without screwing current apps, etc, etc. Does anyone know of an article that explains this if they were to go through with something like this in the future?
I just don't understand why Apple took so long to release the new iPhone if indeed the only upgrade is to the internals. Was the only reason becuase iOS 5 wasn't ready? I mean seriously, iOS 5 looks great, but I would have much preferred to have had the iPhone 4S running iOS 4.3.x for 4 months waiting on iOS5. As would just about everyone else. I'm not buying the iPhone 4S for iOS5. I'm buying it becuase my 3GS is old and I want an upgrade, and have been eligible since February for one... but held off because I wanted the newest.
Maybe they saw that the iPhone 4 was still selling ridiculously well, so they wanted to milk that for all they could, but that's a real big blow to the real iPhone fans out there if true.
I really hope everyone turns out to be wrong and Apple pulls an iPad2 and shows off the iPhone 5 AND iPhone 4S on Tuesday, but it's hard to be too optimistic on that happening.
I love how I read this while I was listening to Don't Leave Me by blink-182, and during the chorus right about the time when Mark sings "She said don't let my door hit your @$$."
Good odds.
For those of us outside the US who have to wait a year for every new iphone, do you guys think the 4S will come factory unlocked?