I would say no, IPS does not obviate the need for Sniper's Eye. Per RAW, IPS says nothing about allowing precision based damage vs targets with concealment, only that you ignore the miss chance. Conversely Sniper's Eye says nothing about ignoring the miss chance granted by concealment, only that you can deliver your sneak attack damage.
The two work rather well together imo.
does Improved Precise Shot obviate the need for Sniper's Eye?
Improved Precise Shot: "Your ranged attacks ignore the AC bonus granted to targets by anything less than total cover, and the miss chance granted to targets by anything less than total concealment."
You ignore the miss chance, but for all other purposes the concealment is still there.