For all the hype about clear status bars I'm kind of disappointed that it turns out only the home screen supports it.
Yeah the caveats with that particular network should be noted. I was able to pop in an existing ATT sim card into my N5 with little trouble (I'll need to change my plan to access LTE) but new accounts will not be able to activate without a device ATT recognizes.
Only the Google search app uses it because it requires new code to be used. For it to be in other apps they would have needed to know about before hand.
Give it some time.