I don't think he will die, he's had too much of a plot in Part 1 & 2 to die that easily.
So did Neji lol
In episode 284, Sai and Lee are fighting Jinin and as Sai finally understands how to use the Sealing Technique he turns to Lee and says this:
Sorry for the image size and quality..
What do you guys think? :shrug:
If Lee dies then its team Tenten