Did he just finally realize Sasuke had the Sharingan or what?
And rofl... How predictable. Diedara going to use himself as a bomb. Anyways, it's about time he died. He was one of the less interesting Akatsuki members anyway.
If Diedara dies and Tobi has escaped Sasuke won't have any leads to Itachi. Perhaps Naruto and the gang will run into Itachi and then eventually Sasuke catches up or something.