According to eWeek.
"Microsoft confirms XP shipments to OEMs and retailers will stop June 30, as planned, ending weeks of speculation XP would live on. Versions will still be preloaded on ULCPCs."
I guess if you need XP after June 30, you have to claim your PC is Ultra Low-Cost PC. How to define it? It's not said from Redmond. I guess anything with a Dua Core CPU and less than 2GB Ram falls in this category. ;)
MS is eager to push Vista out. It means a lot to them. FINANCIALLY!