Microsoft's Service Pack 2 for XP will focus on e-mail security, memory protection, browsing security, and network protection. One default SP2 will have for Internet Explorer is a pop-up blocker.
A test version of SP 2 called Release Candidate 1 (RC1) has undergone beta-testing and will be available Friday via a technical preview program. Feedback is wanted before Microsoft rolls out a Release Candidate 2 version.
The final release of SP2 will be sometime before the middle of this year. Pop-up blocking is already on RC1 which is meant for IT professionals to test. Microsoft says that average consumers won't be asked to download this preliminary version. Source