We want to provide the highest level of service we can, and connecting to a server outside your region makes providing quality support more difficult. We're doing our best to keep the bar raised in terms of supporting you at launch.
I know this means, for some of you, that you should be able to connect to any server you desire. Unfortunately, we cannot provide this service immediately at the North American/Korean launch due to the realities of local billing requirements and privacy of information across international boundaries. That does not mean, however, that solving this issue for you is not important to us, and I reiterate that we plan on providing a solution for those who want to connect cross-regionally.
I hope I've made our reasoning clear to you.

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- Caydiem -
Assistant Community Manager, WoW
Look like few Euros igoing to get in US servers, Usless you got US CC