In a recent interview with Michael Stroller the new Technical Adviser to Electroneum he confirmed to viewers that there were three exchanges that he will be applying to for ETN and this was already in the public domain and on a telegram group.
Michael said that he did not have any contacts at Poloniex so it seems unlikely that ETN would list there at this stage. Since Bittrex has not been accepting new user registrations since 15 december 2017 it seems logical that this will not be the next big exchange either, more probable then would be Binance or HitBTC.
In anticipation of the same issue arising if you are not already signed up you can do so now via the following links: https://www.binance.com and for Hitbtc https://hitbtc.com
While no time scale has been given we do know that the applied exchanges have been fast tracked, and Next.Exchange is due within 2 to 3 weeks. Michael who admitted that he invested well into Electroneum before becoming technical advisor said that if needed he would fly over to meet the exchanges in person.