It's like always: At first 2-3 weeks of OTC trading then some smaller exchange will add XEL eventually. After sometime with eventually good volume a bigger exchange might pick it up. Exchanges usually don't add coins that folks propose to them. They just care about revenue. Take our competitor Golem for example, hundreds of folks contacted them and proposed a Golem listing, but they didnt give a shit. It needed the Liqui-exchange to have revenues ob above 100BTC per day and then they listed Golem as they saw that profits are being made.