Ok, this is what I've gathered, flying thru about every damned thread over on this:

• It appears this will not affect the North American servers. We should be able to go East/West without any trouble, however anyone overseas appears to be fucked. Australia's region is unknown as of this time.
• This may or may not be for a limited time after release.
• There is an apalling lack of response from Blizzard about this issue, so most of the information that I've gathered seems to be hearsay evidence.

Just in case, I am West Coast.