Still no further info on the London region since their announcement post[1] said:
> Today, I am excited to add the United Kingdom to that list! The AWS UK region will be our third in the European Union (EU), and we're shooting to have it ready by the end of 2016 (or early 2017). This region will provide even lower latency and strong data sovereignty to local users.
[1] http://www.allthingsdistributed.com/2015/11/aws-announces-uk...