AWS Autoscalling Rolling over Connections to new Instances

Is it possible to automatically 'roll over' a connection between auto scaled instances?

Given instances which provide a compute intensive service, we would like to

1. Autoscale a new instance after CPU reachs say 90%
2. Have requests for service handled by the new instance.

It does not appear that there is a way with the AWS Dashboard to set this up, or have I missed something?