The new roadmap can be seen here https://blog.twitch.tv/twitch-api-summer-2018-roadmap-update-6036065f0098
No specific dates for things, just a general roadmap for the 2nd half of this year, which is as expected as Twitch don’t give specific timelines for end, the best you can hope for is the Trello roadmap https://trello.com/b/xdoVhmKj/twitch-developers-roadmap which lets you see which endpoints are Explore, In Progress, or Live. Often there are other things as well that are being worked on but not on the roadmap so sometimes new endpoints will just suddenly go live.