The new WordPress version 5.0 will automatically change the Classic Editor you are accustomed to seeing in admin dashboard pages to Gutenberg Editor https://wordpress.org/gutenberg/
You can continue using the same classic Editor for Posts and Pages with Bakery Builder as when update to WordPress 5.0 version will get option to Install the Classic Editor.
Our theme works with WordPress 5.0 version without any issue. Regarding to theme shortcodes, we have been preparing for the Gutenberg version by creating our theme shortcodes for Gutenberg editor, but these are still in development as have been many changes in WordPress core before launch and it was difficult to develop for it until a stable version is available.
Steps to follow in in order to update WordPress to 5.0 version:
1. WordPress 5.0 was released on December 6th. Starting with this date will get in site admin the WordPress update message:
In WordPress Update page will get a message that recommends you to back up your database and files before updating.
3. After WordPress is updated will be redirected to this page from where you get details about how WordPress 5.0 works
4. Install Classic Editor
You can continue using the same classic Editor for Posts and Pages with Bakery Builder by Installing the Classic Editor.
You get the option to install the Classic Editor from the page where are redirected after update.