I was looking through Twitter, when I stumbled across this:
According to the Google Translated version of the webpage I found it on,
http://boxingplanet.ru/vasilij-lomachenko-komanda-rigondo-ko-mne-vchera-pozvonila-i-skazala-chto-boya-ne-budet-video/
the fight is not happening. Quite a shame. If no Walters or Rigondeaux, who for Lomachenko? If not Lomachenko, who for Rigondeaux?