Exciting stuff! Adobe is looking to release it later this year.
From the Adobe Blog post : http://blogs.adobe.com/adobeconnect/2018/06/the-future-is-nearly-here.html
"It gives me great pleasure to show you the second part of our strategy – a new HTML client that runs in any modern browser without the need for Flash Player or other plug-ins. While we’re not announcing any specific product release today, we couldn’t wait any longer to show you what we’ve been working on. The video embedded below shows you the progress we’re making. We’ve been able to incorporate every Adobe Connect pod into this new client – taking the opportunity to make improvements whenever possible. The new user interface is light, clean, and fast. Really fast." See the YouTube video https://youtu.be/pw009ABDmko