https://www.cryptoninjas.net/2018/02/01/bittrex-ceo-will-us-dollar-trading/
Why is this important? Bittrex is one of the biggest crypto exchanges and they heavily use TetherUSD (USDT) as a proxy for real dollars (USD).
Tether is a dark cloud over the entire ecosystem, hopefully this marks the beginning of its removal.
Of course it would be better if they brought in something like BitUSD pairs as well, but we can't have everything.