No exact date for exchange I don't think BUT it looks like they will open their Internal exchange before moving to External Exchanges. I think SAT the 25th is the date they would like to Open the Trading, The Lending Platform will be Beta tested by 20 Lucky people first, I believe this is happening soon. And then slowly rolled out to a limited bunch of people each day Approx 100 People per day. Please watch this Video for the Post ICO Interview with Julian on of the DAV Devs for more information.
https://www.youtube.com/watch?v=smF70TW77zg