Low voltage micro-controllers
They are projecting voltages in the &lt; 0.5~0.6V for the 4-5nm node. The cost will be very, very high and few companies will be able to afford it, so it is unlikely to be applied to general purpose microcontrollers, more likely for powerful SOCs used in mobile phones and tablets. General purpose microcontrollers tend to be generations behind the state-of-the-art, and in some cases employ cast-off production equipment that can no longer produce state-of-the-art memory or processor chips. 

Samsung and TSMC, and probably others, have roadmaps. The transistors  will be nanowire (gate all around) or finFET (the latter current used in processors), not conventional transistors.