it will mostly be for power devices
It looks like it is mostly for remote control and monitoring of things plugged into the power line. It has good social benefits, such as being able to turn heavy loads off during peak demand periods on the utilities.
As far as displacing wireless data computer type links, it does not stand a chance. For one, it requires the units to be plugged into the wall outlet.
There was a US company which has not been funded that did analog modulation television signals over the house wiring. The advantage of their using VHF signal range was that the attenuation of the house wiring was so high that the multipath ghosting was very low level.