It all originates from a video on IGN where Batman V Superman producer Charles Roven says:
“Weâ€™re in the process of looking at that. But we donâ€™t have it on the schedule at the moment because weâ€™re quite busy with the movies that we have scheduled.”
That means that they do want to do a Man of Steel 2 sometime in the future, as a solo Superman movie, but it’s currently not on the DC Films schedule. The solo Batman movie definitely is, but they seem to want to get through the current announced slate of DC movies before kicking off any kind of “Phase 2” with a Man of Steel sequel.