A post by a representative of developer Respawn Entertainment on the official Respawn forums confirms that sniper rifles will be part of Titanfall, but no scoping and quick scoping will not be effective.
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.
These ex-CoD developers have been aware of the feedback and complaints many fans have voiced regarding Quick scoping and Call of Duty. It seems Respawn may have found a solution to these issues for Titanfall, but until fans play it, we don’t know for sure.