This has been added and should be released with the next version on Sunday.

Screenshots of it can be seen here:

For students:
Assignments (default view): http://i.imgur.com/U9OT6U5.png
Home: http://i.imgur.com/c1dAhcH.png

For teachers:
Assignments: http://i.imgur.com/5RDwjXV.png
Home: http://i.imgur.com/sSqPgtT.png

The API did not provide the proper data, but once I had access to sample accounts I was able to build a widget that embedded the entire Classroom web app. This means that it might load a little slower than other widgets but you’ll be able to do almost everything you can in the web app with it.