Note: No further support will be given for this module, it'll work on most (if not all) 4.1 devices. 4.2+ versions of Android are not supported.
This mod replaces the Samsung lockscreen with the AOSP one.
Before - After
Tested on the Galaxy Note 2 but should also work on any Nature UX 4.1.2 device, this includes the SII and SIII.
The mod is open source, and licensed under GPLv3: https://github.com/MohammadAG/Xposed-AOSP-Lockscreen
If you found this mod useful, consider donating with PayPal.
Thanks to rovo89 for his framework.