Hi Loris,
Are you using the TPU on the MC68332? If you are, then you have found a great replacement part in the MCF523x family of MPUs. There is also a full featured evaluation board available (EVB) for this MPU, in addition to limited feature business card computer (BCC).
The MCF523x does not have a memory management unit (MMU) so it would need to run uCLinux, but I did not find a uCLinux BSP for the MCF523x. There are some very good RTOS options for this board including uCOS-II from Micrium.
What is your application? If you don't need the eTPU, then you have a number of other choices. The MCF523x family is the only ColdFire MPU with the eTPU available right now.
Thanks,
Rick