After researching the genetics of WLP644 Brettanomyces bruxellensis Trois, the results are in and the name has been changed to WLP644 Saccharomyces "bruxellensis" Trois, and a new strain added, WLP648 Brettanomyces bruxellensis Trois Vrai, for those looking for the traditional Brettanomyces character.

Full details are here -- http://www.whitelabs.com/sites/default/files/644_Explanation.pdf