Yesterday, a Google employee told the site that this should change soon and Google Glass may even be able to handle navigation and text messages without the help of a companion app.
It’s worth noting that one of the myths surrounding Glass is that it is independently connected to the Internet. That’s not true, however. Instead, Glass users need to have a tethering plan for their phones to connect Glass to the Internet. In the eyes of your wireless provider, Glass is just another device that uses your phone’s personal hotspot feature. This means Glass shouldn’t have to depend on any application that runs on your phone, so the original restriction of making navigation and SMS dependent on the companion app was always a bit odd.
If you're interested in Google Glass you can check out some of the first unboxings here. Notably, Saurik, the creator of Cydia, recently announced that he had successfully jailbroken the device.