Its by state. NJ is a "grand jury" state. PA is not. They can empanel a grand jury (like they did in Penn State sex abuse case) but its not required by state law. Very few states require grand jury indictments; grand jury indictments are required by US Constitution in federal cases.
So in your professional judgment by the DA taking it to a grand jury would you say that means they are going for federal charges or is there possible other reasons to do so?
Edit: Thanks for the above answer. Much appreciated.
