The mayor’s speech also was noteworthy, however, for what it did not mention: the city’s ongoing struggles with violent crime, the continued difficulties of economically impoverished neighborhoods on the South and West sides and a looming, massive cliff in increased pension payments — all sizable problems that will be left for the next occupant of City Hall’s fifth floor to tackle. Later Wednesday, Emanuel hinted that he would give a major speech on pensions in December, but he declined to say whether he would move forward with a plan to address the issue or simply lay out a recommended road map.