Yep, for the 2016 season, the NFL dropped "probable" and redefined questionable and doubtful.
“The ‘Probable’ category was eliminated from the Game Status Report because approximately 95 percent of the players who were listed as ‘Probable’ in prior years did in fact play in the game,” the league explained.
There was a reason for that high percentage of participation. Although many believed that “probable” suggested a 75-percent likelihood of playing, it actually meant that the player was virtually certain to be available for normal duty. After the Falcons scratched quarterback Mike Vick, who had been listed as probable with a knee injury, from a 2005 game against New England, the league reminded teams of the true meaning of “probable,” and it began routinely investigating situations in which a player listed as “probable” did not actually play.
The NFL also has changed the meaning of “questionable” and “doubtful”; previously, the “questionable” category reflected a 50-50 likelihood of playing, and “doubtful” meant a 75-percent chance the player wouldn’t play. Now, “questionable” simply means that “it is uncertain as to whether the player will play in the game,” and “doubtful” means that “it is unlikely the player will participate.”