I honestly doubt they will release AUTUMN of LOVE and SPRING of LOVE. It makes no sense. Especially since AoL release would badically have most of her winter ballads on it because most of them are released in the autumn rather than winter.
And she doesn't have many spring releases so these releases just doesn't feel necessary releases to me. I'd rather have her release a KUUMPLETE ~ALL SINGLES~ in the autumn with few new songs on it.