Windows XP Release 2 coming?

The title is a quote from this ars technica article (interesting site btw…), but I added a question mark as the info is really not precise at all;
I guess [SIZE=4]K[/SIZE] would know more…?

“…Microsoft CEO Steve Ballmer said that a number of important security initiatives were underway for Windows, some of which would be part of a pre-Longhorn “Release 2” for Windows XP…”