The launch of the SDK, according to Eric Migicovsky, shows the Pebble team shifting its focus from getting funding for the project to supporting third party developers. According to Migicovsky, 40,000 Pebble Smartwatches have been produced so far. About 70,000 backers helped fund the project. In addition, the watch is about to receive a firmware update to version 1.9 which will change the UI on the watch so that the right top and bottom buttons now change between different watchfaces you've installed on your Pebble. The update also improves the text rendering engine for developers to make text appear faster and easier.
source: Kickstarter via TechRadar