Rumor or not? you decide.
Good news is that on auspicious day of Holi that is 24th March 2016 JIO 4G will announce the launch on 4G JIO commercial launch.
jio 4g

Tariff plans not known, packs , data offer, voice offer, how many cities or towns? No we don’t know anything.
All will be revealed on 24th March 2016.
To be honest all we know is few handset and first phase of Jio 4G will be announced on 24th March and availability of sim cards and activation will be on from 1st April 2016 for general public. So wait and lets see how much of this is true.

Update : Jiofi2 launched on 16th August 2016
Jio sim cards with preview free 3months unlimited offer