One of Android 4.2's forward-facing feature improvements was the lockscreen, which now has a system for integrating widgets of the users choice. In the stock shipping software, there's an anemic selection of stock widgets such as calendar and a world clock, but we know how many Android developers there are out there making great widgets. Beautiful Clock Widgets is one of the first to be updated with this functionality, and it has a great selection of customizable clock and weather widgets for the lockscreen.
It was only a matter of time before we saw more apps hitting that integrated their own widgets into the lockscreen, and we'll surely see more apps be updated with the functionality in the future. For now, go check out Beautiful Clock Widgets at the Play Store link above. It's free, and if you want to unlock more widgets you can get the paid version for just $1.29.