Premium users are also gaining a couple of new capabilities. One allows you to download entire notebooks to your BlackBerry for offline use, just in case the internet connection you're counting on is a little erratic. And premium users can now set up the app to require a four-digit passcode to unlock it.
Other new features available for the BlackBerry 10 version of Evernote include more integration with Universal Search, improved scrolling, and the proverbial performance improvements. The app is available in BlackBerry World and if you already use it, the update should be available for you to load.
source: Evernote via Engadget