According to the Azure Sphere MT3620 Development Kit product page,
One of the key features of this board is the MPU+MCUs architecture, perfect of IIoT projects. MCUs are required for motor control and time sensitive sensors.
Is there an ETA for the support of the Cortex-M4F cores?
The Azure sphere team is working on the M4Fs, but we do not have the release date yet. Normally ,the Azure Sphere OS release is in quarterly. The latest release is 1902.