This question seems to be a recurring one from the community, and it is something that is high on the priority list. We are very happy to be on Bittrex and we communicate with them regularly, but we recognise the need and community wishes for more exchange options.
In terms of a timeline; we are looking to get all of the blockchain work and necessary swaps out of the way first, as to not needlessly complicate this. Once that is done, we will look into proceeding with new listings
We will try to go for quality over quantity for that, as new/small exchange trouble is still an issue in the space (see recent MapleExchange issues).