Every now and then, a new app show up with the tagline „photoshop killer” or „photoshop done right” (or variation of this). Everytime I see this kind of promotion I smile and I'm pretty sure that would be a failure.
Anyhow, back to Photo Lemur: PS might be more than a photo enhancement solution, so although it might be useful (IF it works like marketed), it surely isn't a PS threat.