GSM & CDMA and the unlocked 4s - Technical or Business based limitation?

So there are many threads about the GSM & CDMA with CDMA only being available on a locked phone and that GSM roaming is at the indulgence on the carrier. I am in Canada so the carrier choices would be different.
My question is whether this is a technical limitation or based (presumably at the request of Verizon in the US) on official CDMA carriers not wanting the 4S to be used on different networks? Will an unlocked 4S never be able to have CDMA enabled or is there no legitimate way to do it? (I am not looking for "sure someone will be able to jailbreak it and turn it on" - though I guess this would answer the technical question, more along the lines of if 6 months down the CDMA is no longer officially locked but you bought your unlocked phone too soon, too bad or you.)
As for why I am asking: I need to wade through Canadian carriers and their plans and figure out which way to go if I get a 4S.

Meg St._Clair wrote:
Existing GSM iPhones will not work on CDMA networks because they don't have the right type of cellular radio. It doesn't matter if they're locked or unlocked. It would be like trying to get an FM signal on an AM only radio. It's just not possible.
The iPhone 4S has both CDMA and GSM capabilities. CDMA phones are not locked in the same way that GSM phones are. But, technical details aside, Sprint phones will not work on Verizon's network and vice versa. It's not clear, to me at least, how this will all play out with the 4S.
AT&T has only ever sold locked iPhones which they won't unlock. I haven't heard that they plan on doing any differently. The unlocked GSM iPhones that you can buy at the Apple Store can use any GSM SIM.
So if I'm a Verizon iPhone 4S user, would I be able to use the 4S if I went to Ukraine and bought a SIM card from an MTS store for their network?

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