Google announced the launch of Google Classroom mobile apps for students. The new Google Classroom iOS and Android apps enable students to take pictures and attach them to the assignments that they submit to you. This could be a great option for math students who have trouble typing responses to mathematics problems as they now can write on paper and submit assignments to you by taking a picture of their papers.
The Google Classroom iOS and Android apps allow students to share material from other mobile apps like Docs and Gmail.
Today, Google also announced new desktop features for teachers. You can now archive your classes when you're done with them at the end of a semester or school year. Archived classes will become "read only" so you and your students can still go back at look at the content, but not change the content. The other new desktop feature is a new teacher assignments page where you can see all of your students' assignments and mark assignments as reviewed.