I don't know if this has already been spotted, but amazon.co.uk has the black riders up for pre-order, with a release date of August 29th:

http://www.amazon.co.uk/gp/product/161661708X/ref=s9_simh_gw_p21_d7_i3?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-3&pf_rd_r=1ZPGD10JBY9RAV23FE12&pf_rd_t=101&pf_rd_p=358549207&pf_rd_i=468294

Nice to know. Pre-order here we come

Pre ordered