"When XP SP3 is going to be released?"
This is one of the hottest topics in microsoft.public.windowsxp.general news group.
So here goes the reply straight from the horse's mouth:-
SP3 for Windows XP Home Edition is currently planned for 2H 2007. This date is preliminary.
SP3 for Windows XP Professional is currently planned for 2H 2007. This date is preliminary.
Ref:-Windows Service Pack Road Map