You can find the AppNana version number on the bottom of the 'Invite' tab.
AppNana announces the exact same features that were already introduced in 2.4.6.
On the Google Play 'What's New' information section they also claim'Add Random Free Nanas on Get Nanas page. Feeling Luck? Check out every day to see if you can find some random free Nanas.', but that has been around in the app for quite a while now and cannot really be called 'new'.
Furthermore they claim to 'Add Italian, Spanish, German, French languages support', but also those options were already available. So my guess (again) is that means AppNana is just improving the language files instead and having some quick bug fixes.
If you know of other tweeks or modifications on this app that I might have missed; please feel free to add it to the comments!
Exchange your code with mine: n6215050 and I will definitely try to return the favor!