My guess by the chats in telegram and slack EOS is going to be listed in bitfinex after the end of ICO. If you are aware of bitfinex they do cryptos with fiat ( not all of them though ) with this being said i can imagine EOS is being traded with BTC and ETH pairs as well as fiats looking at listings of bitfinex previously.
Again, this is my guess based on my experience with bitfinex and conversations on telegram.