Previously I had posted the SharePoint product group's explanation as to why VSeWSS 1.2 did not provide 64-bit support. I am happy to report that the product group announced this morning that VSeWSS 1.3 CTP includes 64-bit support. This incremental release is positioned as a bridge to assist SharePoint developers until the release of Visual Studio 2010 which will include significant improvements to the SharePoint development experience as outlined here.
You can download VSeWSS 1.3 CTP here. The final version has an anticipated release for North America in Spring 2009. I believe I will continue using STSDev for my development work but am pleased to see that the product group is continuing to improve the developer experience for SharePoint.