That's a pipe dream. That's a 2009 concept which has been repeatedly denied by BMW, as it will not sell enough to justify its built. and the website offers no proof, just BS. He lies about spy shots too. That site seems like a prank by a school boy.
However, if there is one we'll know at EICMA this year, which is what I have been waiting for to see if there is any spark of life into the future 1300s.
EICMA is so late this year that manufacturers aren't waiting for it to release new bikes. For example BMW let out the new ADV and also the NineT. Duc the 899 and so on. I guess BMW is keeping the naked RR and the new RT for EICMA and Duc the new Superleggera (although images leaked).