They are claiming 100% compatibility to Cortex-M4. And their lead partner is ST! The first new STM32F7 looks like a faster version of the STM32F429. So in theory, it should not be difficult at all. No idea about practice, though
There are other vendors with good Cortex-M families. But I’ve always been comfortable with our choice of STM32, and today more than just comfortable
The new core is faster thanks to many improvements, looks like almost a factor two compared to the existing M4 cores at the same clock frequency. Double precision FPU is new. Haven’t looked closely at the other details yet.
The first STM32F7 seems to run at 200 MHz, with plans to go to 800 MHz eventually (don’t hold your breath though, this could take a few years…).
If someone is interested in the details (in German, though):
Looks like a good day, today…