Top Level Speculation
There was speculation of him taking on the role even before the Tweet. So, what is really going on here? This comment drew extra attention because very recently Barbara Broccoli who is a producer for the film made comments that she is “open to diversifying the role.”

Top Level Speculation
Diversifying The Role Of Bond Is Inevitable
In a report from the Daily Star, they reported a conversation that Barabra Broccoli had with director Antoine Fuqua. They apparently said “it is time” for a non-white actor to take over the role. She stated an ethnic minority “will happen eventually” and “Idris could do it if he was in shape.” She said, “You need a guy with a physically strong presence. Idris has that.”

Diversifying The Role Of Bond Is Inevitable