She has confirmed once again on Twitter that they won't be using the Saitama Super Arena. And as much as I feel bed for the people who planned to attend the concert, the people are taking refuge there are the ones who don't have anywhere else to go
according to the official site
http://avexnet.or.jp/ayu/jp/news/110325.html they'll either do refunds or exchange tickets for the new dates once they are set?