Apple released the latest build of Mac OS X 10.6.6 Thursday and also announced new restrictions on application developers who want to sell their wares on the upcoming Mac App Store. It has barred developers from offering demos, trial versions or betas of their products on the Mac App Store. Apple has also issued instructions on file system usage requirements and the creation of custom controls for Mac apps. Apple posted the instructions for app devs on its developer site. All apps submitted for review for the Mac App Store must be the fully functional.