I guess she just changed her mind about releases. She did say on her last interviews that she no longer wants to release new songs just for the sake of releasing constantly, and I guess she was referring mostly to singles. She said she'll produce new songs on her own peace and when she feels it's ready for an album, she'll release one. So I guess L was really her last single... Or at least her last physical one. I do hope she'll keep releasing occasional digital singles though, whenever she feels like releasing a new song