That pic of Hikki they chose looks like the evil mother in every J-drama when she finds out her son that is meant to take over the hospital is still dating the girl she specifically told him to dump. It would be right then that the ominous orchestra would start to play.
In any case, I agree with the others. If Hikki hasn't said it herself then its likely just a rumor. (Though I wish it wasn't. I sooooooo badly want another song by her!!!)