I am 99% sure that it is april fool prank by jio because:
1. No official event announced or streamed live.
2. No official tweet by verified handle of jio.
3. They just retweeted.
So, this must be prank.
Was finally able to log into myjioapp and saw that at around 4 PM today a recharge was done on two of my jio numbers. Now I have one more plan in queue apart from the 303 plan that I had recharged for earlier this month. Though for my third jio sim which I use on jiofi this hasn't happened yet.