Starting in Android 4.2, it is possible to add widgets to the system lock screen. For earlier versions of Android (or if you just prefer this option), here is a link to one of my apps that also has a lock screen mode that allows you to include widgets on the lockscreen:
https://forums.androidcentral.com/e...s?id=com.appventive.ExecAssist&token=2gPnsqYF (there's also a free, ad-supported version available).
Executive Assistant also allows you to preview your email, agenda, texts, missed calls, tasks, facebook, twitter, and RSS feeds: on the lockscreen, or a welcome screen, or a homescreen widget w/many sizes & styles to choose from (Android 4.2 lockscreen widget support coming VERY soon).
Cheers,
Steve