Earlier today, Apple announced iPhoto for iPad.
On its iPhoto for iPad webpage, Apple includes an ad for iPhoto for the Mac. Oddly, as seen in the picture above, the system requirements listed for iPhoto for Mac includes the as-yet unreleased OS X 10.7.4. It could be a simple typo, or it could be a hint that a new version of OS X is forthcoming.
Thanks for me, George!