I read somewhere that Sony only used Android Wear for now because their own firmware isn't ready yet. They want to switch to their proprietary firmware once it's ready.
OTOH this really is the only Android Wear device with integrated GPS - which will be usable with the new version of Android Wear coming in October.
Google Nexus 5: Android 4.4.4, KTU84P [ART]
Google Nexus 10: Android 4.4.4, KTU84P [Dalvik]
SE Xperia X10 mini: Android 4.1.2, MiniCM10-4.1.0-20130518-NIGHTLY (JZO54K)
Accessories: Jabra Rox, Sony SmartWatch 2 SW2