After I was able a few years ago to co-develop the L4-microkernel 'MobiCore' (now 'Kinibi TEE' of trustonic) already on Trustzone of ARMv7-A products from Samsung (Exynos4 and Exynos5) and Qualcomm (Kait), I am now looking forward when the first ARMv8-M MCU comes from a chip maker. The ARMv8-M specifications see once already promising. I'm curious how well and safely the TrustZone is useful by the special call - with or without a secure-OS and without a separate memory.
In addition to the 'small' TrustZone I'm excited about the new stack-limit register, the improved MPU and the new CryptoCell's.
In any case, the ARMv8-M (and ARMv8-R without TrustZone but with Hypervisor, e.g. ARMv8-R52) could inspire strongly the IoT- and automotive-world when a good security concept (secure-boot, keys & management, containering, storage) is used!