@Max: "The C0+ based MCUs are more applicable to a wide range of IoT applications". The concept of IoT is not limited to sensors all around wirelessly connected to a local network, it seems like it goes far beyond that limit.
I think we could expect even newer architectures with more processing power-per-mW and more power efficient communications interface technologies showing up soon.
As security is a concern in the IoT, crypto accelerators will most likely be a 'basic' feature/requirement for MCUs/SoCs targeted at IoT applications.
@Stevens: "I am very interesting in bindng IoT and Engergy Harvesting". Perhaps we wouldn't have to wait too long for that as some power management chips targetted at energy harvesting as well as some ultra low porwer MCUs are readily available.
I agree with @krisi "I would think every microcontroller is flexible by definition" and if you let me I would like to add one small detail... if it's running from FLASH/EEPROM and not from ROM masked at the factory or bricked with a static program code it is even more flexible.