So far this was what I could find on Rodrigue Beaubois' ankle injury (that wasn't completely repetitive). He broke the 5th metatarsal in his left foot. Basically, worst-case scenario involves Roddy missing 3 months after requiring surgery. Anything less than that would be ideal so that he could start the season with the team.
Dallas Mavericks confirm report that Rodrigue Beaubois injured foot in France - ESPN Dallas
Roddy Beaubois breaks bone in foot | Dallas Mavericks Blog
Rodrigue Beaubois Knocked Out of Worlds for France -- NBA FanHouse