There’s been some discussion on this thread on Slashdot (updated), which started from this article in The Register UK.
To be clear, Microsoft is not replacing VBA with VSTA or VSTO in Office for Windows. (though VSTA and VSTO are still important developer tools for Office 14)
VBA is here to stay, as was announced some time back by Steven Sinofsky.
The Excel and Access Blogs both have posts covering this from the Office perspective.
Source:→ MSDN BlogsMicrosoft, MSDN, VBA, Office 14, Office14, Microsoft Office, VSTO, VSTA, Technologies