Mos Def recently shared this new song on his Facebook page, and although it only features Flaco's verse for now, it's labeled as "Madlib_Mos+Talib_Untitled," suggesting that the finished product will indeed be a new Black Star track. Talib Kweli has made it clear that there are no immediate plans for a new Black Star album, but the two artists will continue to work together. 

Listen: Black Star "Untitled" (Snippet)