An anonymous source inside of Apple pointed me towards an interesting bit of update news. It seems in the recent update to Camel Audio's Alchemy Synth Mobile, they accidentally submitted an internal version of the app to iTunes! This version has all of the Pro features unlocked by default!
There is a menu item, click the thumbnail to see it in the app, under Extras that flips it between being Pro and Free. Alchemy noticed this as well and tacked on a little message at the end of their update notes:
Ooops! For a limited time try the Pro Upgrade for free! The features are available by default. No additional activation needed. Purchase the Pro Upgrade to keep these features permanently, plus get 100 sounds and 50 loops.
So everyone has the Pro features to enjoy until Apple can get the new, corrected, version approved. Though you could continue to use the Pro features as long as you never updated the app. I think there could be a fascinating ethical debate on my having pointed that out, and welcome that in the (completely unmoderated) comments section. However, you'd never be able to use the "Update All" button in iTunes. I'd rather pay Camel their $15 due than give up that glorious time-saver.
Update: This has patched today, so no more free-ride guys. Fortunately the In-App upgrade to Pro is 50% off!