We have ey-flex coming in a few months. Flex is the multi slice clustered version of engineyard on AWS, replicated db's autoscaling app servers and load balancing, message queueing plus logging and monitoring aggregation services.
So the answer is yes you will be able to replicate a traditional EY cluster setup on AWS in a few months.
So the answer is yes you will be able to replicate a traditional EY cluster setup on AWS in a few months.