According to a post made on the official Respawn forums, while Titanfall will include sniping the developers will be avoiding two rather controversial gameplay mechanics that are prevalent in most shooters today:
Sniping is in the game, but due to how the game plays it’s a pretty different animal than you’ll find in your run of the mill modern military shooter. Quick scoping and no scoping are ineffective.
Personally, I’m glad such a cheap mechanic will not be rearing its ugly head in Respawn’s upcoming shooter/mech title. As someone who prefers sniping, it’ll be nice to play a shooter in which real skill is rewarded instead.