Windows 10 Mobile Word Preview has seen an update today and the version has jumped to 17.6027.10062. The most visible change / feature the update brings can be seen in the bottom left corner in above screenshots. You have a small icon that allows you to do certain things like “Print, Leave a comment and more” by just typing in the box or by using your voice.
There are no other visible change that we could notice but the app certainly is smoother than before. So may be there are bug foxes and performance improvements.