Hi,
for CodeWarrior there is not planned any support for MPC57xx microcontrollers. Instead of CW you can use S32 Design Studio for Power Architecture which is free or you can use third party IDE like MULTI IDE from Green Hills (under license).
Please see following links:
S32 Design Studio IDE|NXP
Real-Time Operating Systems (RTOS), Embedded Development Tools, OptimizingCompilers, IDE tools, Debu...
If you have any other questions, please feel free to write me back.
Regards,
Martin