Microsoft has pushed out updates for Word and Excel mobile.
The changelog for Word (17.6868.47762.0) notes:
Merge and split cells
You can now merge cells to make a heading span across columns, or split cells to show the right level of details.
The changelog for Excel (17.6868.50482.0) notes:
Copy an entire worksheet
No need to start from scratch! Get a worksheet set up just the way you line, and then duplicate it.
Powerpoint (17.6868.42712.0) has also been updated, but without a changelog.
The updates apps can be found at the links below: