After installing the Pebble iOS 7 app, Twitter, Instagram and Facebook notifications will show up on the watch. Even notifications from third party app WhatsApp will appear. While this could have been achieved previously via a jailbreak, now it merely requires the installation of the updated app. In addition, Pebble also introduced SDK 2.0 which will allow developers to use Pebble's APIs to come up with more health and travel related apps, weather alerts and more.
Pebble is currently on 190,000 wrists world-wide with 2200 apps and watch faces available to users. So far, 2 million apps and faces have been downloaded.
source: Pebble via MobileBurn