- Pre-A5 devices already have a tethered JB
with redsn0w 0.96rc8custom bundle in the latest versions of PwnageTool/Sn0wBreeze. A5 Devices will have to wait till another injection vector to be found in the bootrom or userland.
- New kernel breaks MobileSubstrate, and as a result a large majority of Cydia packages that depend on the former.
Saurik cannot be reached for comment but it is understood that a compatible revision could take some time.Saurik is working on a compatible build right now with a new and improved version of Cydia!
- APPL's server is no longer signing 4.2.1 firmware, it is simply too late.
- Downgrade to 4.2.1 using cached TSS blobs will result in a 1013 error due to a mismatch in baseband version. Simply jailbreak again with Greenpois0n RC5 or later to get going, notice that the "auto-reboot" command will no longer kick you out of recovery loop, TinyUmbrella uses the same command and hence no longer works.
- Multi-touch gestures is said to have been taken away in the final 4.3 firmware however it could not have been simpler to have it re-enabled. In \Applications\Preferences.app\General.plist search for "Mutltitasking"[sic], replace them with the correctly spelling "Multitasking" and you are all set. Seems like the engineers got incredibly lazy that they did not even bother to remove the code...
Update: Apparently jailbreak is not necessary, you can edit the said file in an iTunes backup and restore to get the same effect.