I agree. And since Apple tends to add a big feature in every version without reducing any other features, App developers can simply specify, "Requires an iPad with Cameras," "Requires an iPad with a Retina Display," or "Requires an iPad with tactile feedback."
People are just as likely to know if they have a Retina Display as they are to know if they have an iPad 2 or an iPad 3, IMHO.
Edit:
Direct link to iPhoto for iOS
http://itunes.apple.com/us/app/iphoto/id497786065