Canvas 4/20 update:  Most of the changes didn't affect the user experience but a few did.  The updates are separated by red bold brief descriptions from me. 

There is an update to the Canvas Equation editor.   We don’t have the detailed documentation yet. 

Advanced Math Formatting with LaTex through MathJax

Canvas users now have an advanced view in the Rich Content Editor’s Canvas Equation Editor. The new advanced functionality accepts LaTex input for more advanced equation needs and is delivered using MathJax. Users can type LaTeX or paste LaTeX directly in the Advanced View and see a visual rendering of the equation. The existing equation editor has now been renamed Basic View and is still fully functional for introductory math students and courses. Detailed documentation will be available on Saturday.

They've updated the email notifications view. These are the notifications you receive in Outlook about changes, submissions, etc. in Canvas.

HTML Email Notifications

All outbound email notifications now include an HTML version. HTML emails provide formatting and markup capabilities that are not available with plain-text emails, and most email clients default to HTML emails when available. The layout for plain-text emails has also been improved.

Email Text Notification (old view)

Email HTML Notification (new view)

There is a change in the error message for entering incorrect due dates for any assignment.

Varied Due Dates Error Checking

Instructors will receive a notification when they submit an invalid string of due dates for a Quiz, Assignment, or Graded Discussion. Such invalid entries include not unlocking the assignment before it is due, or not placing the due date inside the range of availability dates.

They've added the option for you to make your course syllabus publicly visible.  That will allow you to share your syllabus with prospective students without allowing them to access anything else in your course until the register.  You’ll find this option by clicking on settings on the left toolbar inside your course.

Public Setting for Syllabus

Instructors have the option to allow public access to the syllabus page on a non-public course. Available in Course Settings, this option allows instructors to make their syllabus available to prospective students anywhere they’d like, such as from their department webpage.