Per MS website: support ends April 8,2014.
Personally I will likely have XP on offline systems dedicated for control purposes for years to come as some software is not available in updated versions. This is likely to be true for other niche users choosing or forced by economics to retain older but functional equipment.
At work one application still runs on NT,and continues to do what it did when new.The 5-figure price of a replacement program to do the same job on newer OS is not in the budget.
I have no beef with changing to Win7 except for the hassle of finding drivers for some XP-era hardware that is installed,working, and fills the need.