From what I hear, she quit; she refused to do any more KH themes.
Utada Hikaru is on hiatus.
So THAT'S why the last couple of Kingdom Hearts games don't have any new theme songs.
I heard it was on grounds of... she wasn't getting paid (by Disney of all people)
BoA's okay. I cite Utada because she's the best of both worlds in regards to clarity.
White Wishes isn't really my favorite too, so ... meh, I like her other work.
I'm curious about Ayumi Hamasaki's Fate Making track... pop isn't really Tales, so I'm interested to see what she'll do.