See this description about Young Scholars from the NAGC conference:
http://nagc.org/uploadedFiles/Conventions_and_Seminars/School%20Programs%20Panel.pdf
First implemented in 12 schools in Fairfax County Public Schools (FCPS) in Virginia in 2002, the program
is currently in 82 schools, serving more than 6,400 students. The Young Scholars Program identifies
students from diverse cultural, ethnic, and linguistic backgrounds, who are not likely to be considered for
gifted programs using traditional methods of identification, and who are less likely to pursue advanced
levels of learning without intervention.
In 2009 – 2010, 2,253 Black and Hispanic students were enrolled in the Young Scholars Program
in K – 8. In 2012 that number increased by 21% to 2,724.
From the materials posted, it is not known whether the remaining 3,600+ of Young Scholars students are in the low-income group, but I tend to doubt it.