This blog post is brought to you by Allison Bokone a technical writer for Excel. With the wide variety of solutions available for automating, customizing, and extending Excel, it can be hard to determine which technology to use.
More here:
New Excel Developer Roadmap on MSDN
And the the Road map is?
And, we can expect it when?
And, it is published where?
Is there a plan or is MS just winging it?
It can be found here:
http://msdn.microsoft.com/en-us/office/ff458124.aspx
I have no answers for your questions…although I doubt MSFT is winging it.