Third party developers have been unable to easily write apps for Google Glass; but the upcoming XE10 update to the connected specs will give the code jockeys the tools they need to start writing third party apps for Google Glass. Developers will have access to the sensors and features, and the update is expected some time next month...
Source: http://www.phonearena.com/news/Google-Glass-to-get-an-update-that-helps-third-party-developers-write-apps-for-the-specs_id47782
Source: http://www.phonearena.com/news/Google-Glass-to-get-an-update-that-helps-third-party-developers-write-apps-for-the-specs_id47782