If you're currently dissatisfied with the selection of lockscreen widgets for Android 4.2 devices, a fantastic new entry from Android Engineer Roman Nurik just hit the Play Store. It's called DashClock Widget, and it's one of the cleanest, best-integrated widgets we've ever seen.
DashClock Widget combines many of the most common widgets – Gmail unread count, weather, calendar, missed calls, text messages, and alarms – into one clean, sophisticated, customizable widget. The clock is the only thing that's static, so you can choose which "extensions" should be displayed. And if you want to remove one, you can swipe it away in the settings menu.