The current build has the following capabilities:
- Can create new workbooks
- Add worksheets
- Access cells using R1C1, A1, and mixed notations.
- Add text, dates, booleans, and numbers to cells
- Select ranges (not named ranges though)
- Format cells/ranges
- Numeric/Date formats
- Traverse a range's columns and rows
- Merge/Unmerge ranges
Please check the Documentation
for more information.