We've been following it all morning from the UK, massive disruption at our airports too. They spoke to their Singapore correspondant and aparently Universal Studios Tokyo have had outages, everything from ticketing to Air con being offline.
Does make me wonder, how many of the attractions at WDW or systems behind MDE are going to be affected...guess we'll find out in about an hour.
Upd: Looks like no issues, guess thats the perk of using Windows XP