Apparently Nate Trues soft upgrade for jailbreaking 1.1.3, also breaks the functionality of the coming Official SKD Applications
iPhone Atlas interviewed the reputed iPhone developer Jonathan Zdziarsk, and he had some interesting things to say
Don't worry though, according the Hackint0sh, the dev team is hard at work testing their "true" 1.1.3 jailbreak, and it should be available soon!You might want to think twice about applying the current iPhone 1.1.3 jailbreak soft-update (Mac or Windows) that was released (but not solely developed) by Nate True. Weve received word that the method may prevent installation of official third-party applications that will be created by the forthcoming iPhone SDK (software development kit) from Apple. The reason: this jailbreak method breaks Nikita, a component that is responsible for installing signed software. It appears that the current process is reversible, but almost certainly wont be able to co-exist with official third-party apps.