Despite Google's claim that the LG Watch Urbane is the only current-generation hardware that would be supported in Android Wear on iOS, it appears as though many other watches can connect as well. We have been able to connect a Moto 360, LG G Watch and others, with some issues along the way. For example, we have seen duplicate notifications on the Moto 360, some of which won't clear from the watch. Also, changing watch faces from within the app seems to be hit-or-miss right now.
While other watches can connect, it is clear that the experience was set up for the LG Watch Urbane and newer hardware. If you own an Android Wear powered watch, and an iPhone, be sure to let us know if the two connect and work for you.