Michael Klucher, a program manager at Microsoft working on XNA, recently posted to the XNA Team Blog about updates to Game Studio Express and the XNA Framework. In his article, Michael mentions that bitmap font support is being added, as well as improvements to the math API and XACT. Also, GSE will finally have official support for running on Windows Vista.

Nothing yet on if the changes include support for Game Explorer, but I'm sure that it'll be added eventually. In the meantime, my article is still on schedule for release next week.