- Attorney general will make final call, but expect White House, other top-level input
- Dzhokhar Tsarnaev, 19, was advised of his rights as well as the charges at hospital
- Suspect's lawyers are expected to waive "speedy trial" requirement, sources said
- Tsarnaev's wounds, limited communication among variables that will affect course of case
Upon his surrender, suspected Boston marathon bomber Dzhokhar Tsarnaev was placed in the immediate custody of federal authorities and remains under guard at a Boston hospital.