A couple of hours ago, Apple finally pushed iOS 4.0. Saurik also pushed two new critical updates for Cydia and MobileSubstrate , both optimized for iOS 4.
There is no official changelog, so we don’t know if there’s something new in these update, but from what we can tell, Cydia seems a bit faster and MobileSubstrate is not fully optimized for iOS 4.0. The new MobileSubstrate crashes the device to Safe Mode every time an app that uses the MobileSubstrate is loaded. Expect a new update soon…