Why All the "New" Strategies?

Because Rahm is getting hammered nationally and needs to stop the bleeding of his ambitions:

• Rahm Emanuel’s $3 million anti-violence program was supposed to defuse Chicago’s exploding murder rate. But has it? Despite the PR spin from the Mayor’s office, the numbers don’t lie.
  
  In summer 2012, the glare of the national spotlight was on Chicago. The city’s out-of-control murder rate demanded a response. Mayor Emanuel was under intense public pressure to show he was taking immediate action. School-age children like seven year-old Heaven Sutton were being caught in the bloody gang crosshairs. The body count was mounting. Chicago was desperate for an answer to the violence, and the funerals, and the hopelessness.
  
  It still is.
  
  So Mayor Emanuel signed a three year multi-million dollar contract with CeaseFire, the anti-violence group made up of ex-cons, to “interrupt” violence in Chicago’s high crime-addled areas of Woodlawn and North Lawndale.
  
  Under the controversial CeaseFire “model,” workers attempt to mitigate or “interrupt” violence on the street before it turns violent. Because many of the “workers” are ex-gang members, the group argues that it has street credibility to mediate that police officers don’t.
  
  But, according to numbers released this week, that model appears to be failing.

The article rips Rahm about the cash spent on CeaseFire with no tangible results, so he appears not only helpless in the face of violence, but gullible for this stunt, and gullible doesn't win national office - usually.