Apparently Priebus (former Chief of Staff) resigned yesterday. It just wasn't released until today when Trump announced that General Kelly will take over as Chief of Staff.
Source
So what about DHS? Well Elaine Duke will take over for now and just to reduce concern a bit about the swamp taking over at DHS apparently Trump had already nominated her in January to get the Deputy secretary of Homeland Security. So he must have some faith in her.
That's all for now, questions are welcome.