Q: What are these new features I keep hearing about?
A: Windows XP Service Pack 3 will not include any major new features, but it will include four minor new features that improve the system's reliability and security. Contrary to reports, Microsoft has been very up-front about these functional additions for quite some time now.
These new features include:
Network Access Protection compatibility. Announced years ago, this feature allows Windows XP machines to interact with the NAP feature in Windows Server 2008. This functionality is built into the RTM version of Windows Vista as well.
Product Key-less install option. As with Windows Vista, new XP with SP3 installs can proceed without entering a product key during Setup.
Kernel Mode Cryptographics Module. A new kernel module that "encapsulates several different cryptographic algorithms," according to Microsoft.
"Black hole" router detection algorithm. XP gains the ability to ignore network routers that incorrectly drop certain kinds of network packets. This, too, is a feature of Windows Vista.
And that's about it. Nothing dramatic, as promised.