I think she needs to release a powerful epic ballad this autumn after releasing her usual summer hit. Her biggest hits have been ballads and she hasen't released one in ages:
"Love ~Destiny~" @1 sold 650,800
SEASONS @ 1 sold 1,367,400 her best selling single song to date
"M" @1 sold 1,319,070
THen there's voyage, No way to say. Her last A side ballad was HEAVEN back in 2005

SHe doesen't ned to do something fresh, she needs a ballad that is very easy on the ears, that har a beautiful melody and profond, but accessible lyrics.