Office for Android July 2017 feature update now rolling out. The new update brings new features to PowerPoint and Word, but they are not anything major, and while the changelog in the Play store is not very informative.
You can now copy and paste with formatting into your documents which means if you are copying a text with a different font or text color, pasting it into Word will retain those formatting. Microsoft is also adding the ability to set custom margins for Word documents. And lastly, Word now lets you search and copy text on PDF files.
Excel adds a numeric keyboard to help with number entry. As for PowerPoint, Microsoft is bringing comments to the app which will let you add, edit, delete, and reply to comments in your presentations right from your smartphone.