Things I need to know about the Unlocked IPhone 5, Verizon network?

So i'm Irish and and i'm going to New york on holiday in the next week. I've been planing on buying an Unlocked Iphone 5 while i'm there for use at home here in Ireland, only to learn that the Official unlocked IPhone 5 has yet to be released in the US

There's a very small chance that it will be released within the next two weeks so that seemingly rules out my chances of buying one. But today a friend had linked me with a site that claims that all IPhone 5's sold on the Verizon network in the US are unlocked phones.

http://www.huffingtonpost.com/2012/09/25/verizon-iphone-5-unlocked-att_n_1909972.html

On that point i know about apple's international warranty clause that basically annuls the warranty outside of the country which it was bought and i also know my country does not yet have 4G network.

But i was just wondering would the Verizon phone work properly back in Ireland and/or will sites like
http://www.iphonefactoryunlocks.com/

work to unlock the phone for use in Ireland

Added (1). To Scott: thanks very much, but its not a problem getting one in Ireland, in fact the IPhone that are sold here are unlocked, what concerns me move are the price i could save over 200€ by buying one in the Us

Yes, Verizon iPhone 5s are unlocked but you would need to be American in order to purchase them, not to mention all the fees attached & then the inevitable early termination fee.
I'd look into getting one from the UK.