As noted in this post, Coding Challenges will, for now, continue to use the functionality first built for Discussions. The longer-term plans for Challenges are still taking shape, and any questions about that experiment should be asked on that post.
At this time, we do not plan to restore the Discussions experiment on Stack Overflow. We have learned a great deal from the usage of Discussions and feedback about the experiment and the overall concept. While Discussions won’t be coming back in the form you saw in the experiment, we are exploring how we can allow for a broader range of technical conversation and how this content might exist alongside core Q&A, as noted in a recent look at our roadmap.
Observations and feedback from the Comments/Discussions experiment have also been valuable, as well as hearing from community members about potential implementation of a more focused scope for a conversation space. Conversations about the evergreen topic of closed questions have also been very insightful, and are highly relevant to those explorations.
Existing Discussions posts will remain hidden, but they are not being deleted outright, and there is potential for that content to be resurfaced in the future.
We appreciate all the ideas, feedback and community effort around Discussions, with a special shout out to the Discussions Moderators. We look forward to sharing more ideas about the concept in the future.