Official Google Blog: Collaborate and edit anywhere with the updated Google Docs for Android

Check the full post for a cute real-time collaboration scenario video

We want to give everyone the chance to be productive no matter where they are, so today we’re releasing a new update to the Google Docs app for Android. We've brought the collaborative experience from Google Docs on the desktop to your Android device. You'll see updates in real time as others type on their computers, tablets and phones, and you can just tap the document to join in.
We also updated the interface to make it easier to work with your documents on the go. For example, you can pinch to zoom and focus on a specific paragraph or see the whole document at a glance. We also added rich text formatting so you can do things like create a quick bullet list, add color to your documents, or just bold something important.

Official Google Blog: Collaborate and edit anywhere with the updated Google Docs for Android