Maybe. It is very likely. Microsoft have been dreadfully pushed by the authorities about compliance with general trends. I have absolutely no doubt Internet Explorer 7 will be more standards compliant than Firefox. Visual Studio 2005 is greatly Standards Compliant and ASP.NET 2.0 is even more so with its XHTML output and such like.

Firefox is already not very compliant. If you've ever seen MyMSN in Firefox then Internet Explorer you'll know.