David Gainer, the Group Program Manager for Microsoft Excel has a blog what will discuss the upcoming Excel 12. He says:

I am going to be writing about what’s new in Excel 12…I plan to write this blog from now until around the general availability of Office 12

In his first post, he tells us that E12 will have “1,048,576 rows by 16,384 columns. That’s 1,500% more rows and 6,300% more columns than in Excel 2003”

How exciting! I look forward to reading his blog daily.