According to this Engadget article, yes.

The much anticipated XP SP3 will be coming out on 29th April, hitting Windows Update and Microsoft Download Centre.

There’s not much info about it for now, so more on this as I find something interesting.

For now, I know that there will be around 10% speed boost, and possibly a version of DirectX 10 for XP. Maybe! Nothing confirmed yet.

I also downloaded the Whitepaper of SP3. There is no mention of DirectX 10 for XP. It’s just a rumor I heard. But I can say there’s some new “features”, mainly regarding security issues. Like the ability to skip entering a product key at install, but later supply it as part of Windows Genuine Advantage.

For people who want the Whitepaper, it’s here.