In order for a law to go into force it has to be promulgated. Usually, unless laws specify otherwise, they go into effect three months after they are published in Acta Apostolicae Sedis (AAS). Neither the new GIRM nor decrees ordering the publication of the new Missal have been published in AAS or promulgated through other means. Therefore, these are not yet in force. Their current legal status is (essentially) drafts of future law that have been shown to the public early. They are not yet promulgated.
When they will go into force is not clear. Rome has not made an announcement. Until such time as that happens, the current law remains in force.