Will Levi die in Attack On Titan season 2?

It's only a rumor as of now.
Attack on Titan does seem to stick to the manga pretty well, so unless Levi dies in the manga, I wouldn't worry too much... Unless they don't stick to the manga this season... then maybe worry.

Of course no one will know for sure until season 2 actually airs.

He'd better f***ing not. I'll lose my s*** if he does

I can't see Levi being killed since he's such a người hâm mộ favorite. If he died, I'm sure the series view would plummet. But then again, the creator of SnK is quite cruel...