We saw just yesterday that Beautiful Clock Widgets was updated to support Android 4.2's new lockscreen widget functionality, and now HD Widgets is following today with its own update. There are many to choose from, and the update includes 11 new widgets in total -- 5 for the phone and 6 for the tablet -- for you to customize your lockscreen with.
We'll surely see more developers update their apps with this functionality as Android 4.2 gets onto more devices out there. For now, there are a couple good ones to choose from at least. HD Widgets will only set you back $1.99, and is available at the Play Store link above.