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http://us.battle.net...opic/7393109275
Blizz has commented here but it was as usual unhepful...
http://us.battle.net...opic/7393179277
Anyway nothing more to add at this point in time sadly. Hopefully a fix will be sorted asap.
Cheers,
Mae
EDIT: Seems it is a DNS issue - if you alter your DNS to google DNS servers you can log in.