Possible storylines for season 4

If abc is successful in bringing the show back for season 4 what storylines would people like to see. I would like to see Trent return. I also hope that Sam returns and so does bud. Megan and tommy are happily together but she is dealing with unresolved issues regarding peters death and admits to tommy that she regrets never telling Peter who she felt about him. Ethan enjoys the perks of being a chief medical examiner. Kate ends up becoming a senator for Philly and works on the medical board but offers Megan her old position because she is longer able to continue due to her political affairs. Lacey gets a boyfriend and Joan decides to start a career in cooking.