At the moment, it is available for your viewing pleasure here:
http://www.dssd.ca/Wine-FAQ.html
From the FAQ: --- Will MFC work with Wine? What do I need to do?
Work is underway to support this. In fact a libmfc42.so has already been written. You can expect a working MFC porting system relatively soon. ---
What is the status of this libmfc? It's not mentioned in the status page http://www.winehq.com/about/index.php?status
Thanks
bye Fabi