Probably another spurious Amazon release date but at least we can now see the front cover art:

http://www.amazon.co.uk/gp/product/1589945506/ref=s9_cpic_c5_t7?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-4&pf_rd_r=15HHBTBT5JJSVGV57C1E&pf_rd_t=101&pf_rd_p=463374873&pf_rd_i=468294

Please ignore, I now see this is old news.

Amazon UK would also seem to have a pre-order for RT, release date in August.