As I said in the TechCrunch comments -
If it's anything (it's not, but it's fun to pretend), it could be a sign of integration between the Mac and iOS App Stores. Even if one isn't actually being rolled into each other (which I would assume they wouldn't be unless iTunes was redesigned), it could just be saying "this is also available as a Mac app," possibly with a link to the Mac App Store page.
We already have Universal apps that run on both iPhones/iPod touches and iPads. It would make sense if Apple was to add Mac apps to the deal.
It seems like it's a localization string identifier, which means it probably stands for a tangible product, and it seems strange that a developer would randomly add and commit that change.
I'm going to guess that it was a mis-merge in the App Store codebase and that Lion will be able to run iOS apps (using the MacBook touchpad or Magic Trackpad for multitouch). I mean, Snow Leopard already runs iOS apps pretty much natively if you have the SDK installed.