This time the XP service pack is on the hands of the former Windows Server 2003 SP2 Beta Team, that happened to do a pretty good job both in the last year and now, with this SP3 v.3180.
I've been notified yesterday to download my copy and AFAIK this is a compilation of all hotfixes and patches to XP up-to-date. (as in ~900 problems with XP SP2). You can see in the screenshots from Part 5 of my guide that there aren't any visible changes since SP2.
changes
Main impact at this point is for Windows XP Starter Edition, if you have SP2 I'd recommend you slipstream this SP3 now. There are also some minor improvements in Bluetooth and USB support.
There are some new drivers for WDM in ATI and NVIDIA, and AMD K8. Mostly driver improvements that were made available earlier for Server 2003 SP2.
product keys
MSDN and Technet subscribers' keys are available. A lot of retail keys have been blacklisted.
productkey.jpg (111.84K)
Number of downloads: 266
From the looks of PID, I'd say Microsoft is aiming for allowing the installation of XP SP3 without a product key, using a default staged one, that you can change later.
nLite support
As nLite already supports all the hotfixes integrated by Microsoft in this v.3180, I bet compatibility is close to 100% for removal. I tried 3 combinations today and all work.
The only possible bug is that slipstreaming SP3 into SP2 Media Center 3.0 results in SP3 Media Center 2.8. I think they might be rolling back some code for a new Media Center 2008, but it's too early to tell.
priorities
As for the priority of the SP3 Beta, it's quite obviously the last. The delay is perfectly justified because both Server 2003 SP2 and Vista RTM were, are and will be more important than XP.
Microsoft never handled more than 2 concurrent OS beta programs and we've just had:
1) 2003 SP2 Beta -> RC / Vista Beta 2 -> RC
2) 2003 SP2 RC -> RTM / Vista RC -> Vista RTM
Vista RTM codebase becomes Server 2008 Beta 3
2003 RTM codebase becomes 2003 Home Server Beta
3) Server 2008 Beta 2 -> Beta 3 / 2003 Home Server Beta -> RC
and now, we have:
4) Server 2008 Beta 3 -> RC / XP SP2 -> SP3 Beta , with the server taking priority.
I'd say this list pretty much explains the delay

If you've tested Server 2008 Beta 3 after testing Beta 2, you already got the general feeling of "codebase sharing"
Enjoy!
This post has been edited by dexter.inside: 09 August 2007 - 01:33 PM