Please review this blog to see all the latest updates to Web AppBuilder embedded in ArcGIS Online,
What’s New in Web AppBuilder for ArcGIS (June 2017) | ArcGIS Blog
Is there any exact date on when the new version will be released as a developer edition ?
FYI, we just released it
Web AppBuilder for ArcGIS v2.5 Developer Edition Now Available! | ArcGIS Blog
Hope this helps,
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