I think Libra; when released will be nothing like what many anticipate - a cryptocurrency in shinning armor, I feel it will be more of an electronic money masquerading as a crypto-currency, minted, censored and controlled by the same centralized giants who rule the current payment system - Visa ,Mastercard, paypal etc. They are listed as being the founding members of Libra Association Council who will set the rules, government the network , run the nodes (each costing 10m $) etc and I dare to add, accept,deny, reverse or freeze transactions at will. Also, Libra will be backed by Government securities which brings in the Government regulators, Central banks etc.
The Libra Association is deemed "non- profit" and at the same time they are required to invest money to be a part of it, Guess whose interest they will serve?
They may indeed run it on the blockchain but I see another JP Morgan coin, not a cryptocurrency that is people-centered like bitcoin
https://cointelegraph.com/news/facebook-releases-cryptocurrency-white-paper-for-libra-currency