WordPress 4.7 Beta 2

WordPress 4.7 Beta 2 is now available! This software is still in development, so we don’t recommend you run it on a production site. Consider setting up a test site just to play with the new version. To test WordPress 4.7, try the WordPress Beta Tester plugin (you’ll want “bleeding edge nightlies”). Or you can download the beta here (zip).
Notable changes since WordPress 4.7 Beta 1:
Twenty Seventeen: The theme wasn’t being installed on upgrades – sorry about that! Now you should see it if you’re upgrading an existing site. There are also plenty of fixes, especially for the header and small screen views.
Edit shortcuts: These are always visible while editing (hide them on bigger screens by collapsing the controls) and should now work properly in Firefox. (#27403 and #38532)
REST API endpoints: There have been a number of changes over the past week; your attention is requested on the following:
The DELETE response format has changed and may need to be accounted for. (#38494)
Enabled querying by multiple post statuses. (#38420)
Return an error when JSON decoding fails. (#38547)
Various bug fixes: We’ve made almost 150 changes in the last
Source: https://managewp.org/articles/13767/wordpress-4-7-beta-2

source https://williechiu40.wordpress.com/2016/11/04/wordpress-4-7-beta-2/