EOS is a new cryptocurrency imagined by Daniel Larimer (Founder of steem and bitshares).
It's very similar to ethereum but scales better using delegated proof of stake.
(which to me seems more centralized, but that's for a different post...)
Two days ago, the Bitfinex exchange released an anouncement that stated the following:
On Saturday July 1, 2017 we will be adding support for EOS (EOS) exchange trading through EOS/USD, EOS/BTC, and EOS/ETH pairs. Margin trading for EOS pairs will be enabled in the coming days as the order book develops suitable liquidity.
EOS is a development platform designed to make production of high performance decentralized applications fast and scalable.
EOS is being designed by an experienced management and development team, and boasts co-founder Daniel Larimer who’s previously founded two community projects that now have over 1 billion USD in aggregate token value. Daniel introduced the concept of the DAO in 2014 and is the inventor of Delegated/Nominated Proof of Stake (DPOS).