If I were writing the big book of maintaining morale, my number one rule for keeping the talent happy would be: don't threaten to take them to court. But those mavericks at Ubisoft have always done things their own way. According to Assassin's Creed 4: Black Flag voice actor Matt Ryan (who played protagonist Edward Kenway), Ubi was a tad miffed when he got loose-lipped about the unannounced Black Flag remake we all know is coming. So miffed that the company threatened to sue him.
If you don't recall, Ryan was signing fan autographs recently when he cheekily announced that they "might have to beat [AC4] again" in the near future. Everyone and their dog took that as a hint at an upcoming remake of Black Flag, the same one that was also leaked by a merch-maker pretty recently. Heck, Ubisoft boss Yves Guillemot was about and about last year saying he wanted to make some AC remakes, so it couldn't be more of an open secret at this point.
