Running Istio on Bluemix Container Service with the Bookinfo demo. If I do kubectl get svc I can see that istio-ingress is assigned an external IP, but when I do kubectl get ingress the Address field is left blank. If I check the istio-ingress logs, I see:

I0523 19:48:25.146704 1 status.go:302] updating Ingress default/gateway status to [{169.47.245.10 }]
W0523 19:48:25.149243 1 status.go:306] error updating ingress rule: Forbidden: "/apis/extensions/v1beta1/namespaces/default/ingresses/gateway/status" (put ingresses.extensions gateway)

I updated the install/kubernetes/istio-rbac-alpha.yaml to add "ingresses/status" resource to the istio-manager cluster role and the address starts being populated.