Mid or late this month.
Hi Finbar,
We're targeting the release for sometime in the Jan 23rd week.
EDIT: Release date moved a week later.
Hope this helps,
Certification testing was completed early, so Web AppBuilder for ArcGIS Developer Edition v2.3 is now available!!
Checkout the blog: Web AppBuilder for ArcGIS v2.3 Developer Edition Now Available! | ArcGIS Blog
Hope this helps,