Is it possible with 1.1.x and above to somehow use AWS elastic load balancer? Have services link to an external load balancer as such?
Basically this would enable easy, automated blue/green deployments for us! 
I use an ELB to send traffic to the cattle instances (layer2) then use the rancher load balancer to do the routing between the containers at layer7 depending on request host and request path. It works really well for us.