is there a plan to launch txbit.io in Q4 this year or is it going to be launched by 2019? I could not find much info on that.
They just launched a twitter handle for the exchange today along with the news that community voting to add 5 coins for free is starting in a few days.
https://medium.com/@txbit/txbit-io-community-coin-vote-round-1-ca1b23b35f87It looks like the exchange will be going live, at least in some beta form, once the voting ends.

That is very good news. So, just to clarify, solaris will be like a BNB or a Kucoin Shares to txbit.io exchange?