The last info I was able to glean from Slack/Telegram is the devops team is working on resolving another error they found when trying to bring up the live-net related to the replay attack fixes they put in to appease Bittrex and avoid a DAOesque disaster. 

Timeline sounds like the chain should be live anytime within the next 24-36 hours for mining, but right now any miners showing successful blocks will likely be made invalid when the fix is put in.

As far as Bittrex, I've heard, but not verified that they will have trading live within 36 hours of the genesis block being propagated and the chain going live successfully.