In March 2011 I found 16 MG & YA releases, in 2012 I found 4 and this year, 6. Nonetheless, this looks like a pretty impressive list of books! All are very establish authors.
(clicking the image will take you to a description of the book.)
The Keysha Diaries, Volume One: Keysha’s Drama\If I Were Your Boyfriend (Kimani Tru) (9780373091249): Earl Sewell: Books
Flowers in the Sky by Lyn Joseph
Yaqui Delgado Wants to Kick Your Ass by Meg Medina
Panic by Sharon Draper
Hollywood High: Get Ready for War by NiNi Simone and Amir Abrams
Orleans by Sherri L. Smith
Twelve Days of New York by Tonya Bolden and Gilbert Ford