Did they make any official comments yet whether they will do an ICO/IEO for LIBRA or they will be just minable?
NO ICO/IEO for Libra and Libra isn't minable. Libra is based on proof-of-stake. If you are ordinary people, you can't make money on Libra since it is like a 'stable coin'.
If you want to earn money with Libra, maybe you can be one of the founding members that paid a minimum $10 million, just what said below and you can read more about Libra there.
Libra is totally different on some cryptocurrencies that are totally shit and scattered over that doing such an ICO/IEO just to scam and steal people's money.
Each founding member paid a minimum of $10 million to join and optionally become a validator node operator (more on that later), gain one vote in the Libra Association council and be entitled to a share (proportionate to their investment) of the dividends from interest earned on the Libra reserve into which users pay fiat currency to receive Libra.