Anime Expo has announced that seiyuu Yui Horie and Eri Kitamura will be attending as guests. AX also said that they will be their to promote Toradora!. Horie has previously worked on anime, notably voicing Naru Narusegawa (Love Hina), and Makie Sasaki (Negima!).
Personally, I think it's awesome that AX has seiyuu come over from Japan to be guests. It gives US fans the Japanese perspective of voice acting. I hope AX continues to do this in the future, especially since many fans enjoy the Japanese voice acting over the English VAs.