[tshawkins]

Because the apps will be running on controlled development libraries that might be able to.... perhaps multitask in OS 4.0, remember guys this is a phone we are talking about here, not a games console, security is paramount, and apple is just trying to put the the genie back into the bottle before a mass of insecure apps are elevated up the permission chain in 4.0 to be able to operate on a par with apple authored apps.

[MutantSushi]

using a different language doesn't affect security, the executable is still within the same sandbox. please read up on the plethora of projects allowing other languages to work with Cocoa, including desktop OSX, including Apple-funded projects like RubyCocoa.