The AP is reporting he’s on his way to the White House to be fired. Bloomberg says he’s tendered his resignation and it’s been accepted. No official statement from the WH.
Update from The Daily Beast and Rawstory
Rosenstein “has not submitted a resignation and is still the Deputy Attorney General,” a source familiar with the situation told The Daily Beast, adding that he is “expecting to be fired.”
Further Update - It seems as if Rosenstein has been granted a stay of execution. Right now he is still Deputy Attorney General but will be meeting with trump on Thursday to discuss his future. Thanks to VulcansAreHearbreakers for the link