With Sniper's Eye you can sneak attack your opponent, even if if he has concealment. Normally you wouldn't be able to do so, as clarified in the rules.
Sneak Attack wrote:
A rogue cannot sneak attack while striking a creature with concealment.
Sneak attack however requires the target to be denied its Dexterity bonus to AC. This prerequisite is still in effect, the talent does nothing to omit that.