Starting today, Inter-Region Virtual Private Cloud (VPC) Peering is available in AWS EU (London), EU (Ireland), EU (Paris), Asia Pacific (Mumbai), Asia Pacific (Sydney), Asia Pacific (Singapore), Asia Pacific (Tokyo), Canada (Central) and South America (São Paulo) Regions in addition to AWS US East (Northern Virgina), US East (Ohio), US West (Northern California), US West (Oregon) Regions.
與現在的 region 表格比較，剩下的是 ap-northeast-2 (南韓首爾) 與 eu-central-1 (德國法蘭克福)，其他公開使用的區域都在這波的公告全上了。(也就是美國政府專屬區域與中國區不算在內)
不過當時不確定跨區域時怎麼處理傳輸加密 (或者沒有處理？)，這邊 Jeff Barr 補充提到了一些細節：
Data that passes between VPCs in distinct regions flows across the AWS global network in encrypted form. The data is encrypted in AEAD fashion using a modern algorithm and AWS-supplied keys that are managed and rotated automatically. The same key is used to encrypt traffic for all peering connections; this makes all traffic, regardless of customer, look the same. This anonymity provides additional protection in situations where your inter-VPC traffic is intermittent.
Global Tables – You can now create tables that are automatically replicated across two or more AWS Regions, with full support for multi-master writes, with a couple of clicks. This gives you the ability to build fast, massively scaled applications for a global user base without having to manage the replication process.
Updates are propagated to other Regions asynchronously via DynamoDB Streams and are typically complete within one second (you can track this using the new ReplicationLatency and PendingReplicationCount metrics).
不過如果是這樣的機制，conflict 的問題不知道怎麼解決... 文章裡面沒看到。
然後目前支援的區域還是有限：
Global Tables are available in the US East (Ohio), US East (N. Virginia), US West (Oregon), EU (Ireland), and EU (Frankfurt) Regions today, with more Regions in the works for 2018.
另外一個是備份與還原機制，有這樣的功能對很多計畫方便不少：
On-Demand Backup – You can now create full backups of your DynamoDB tables with a single click, and with zero impact on performance or availability. Your application remains online and runs at full speed. Backups are suitable for long-term retention and archival, and can help you to comply with regulatory requirements.
而備份還原機制是陸陸續續開放的，區域也有限：
We are rolling this new feature out on an account-by-account basis as quickly as possible, with initial availability in the US East (Northern Virginia), US East (Ohio), US West (Oregon), and EU (Ireland) Regions.
Inter-Region VPC Peering is available in AWS US East (N. Virginia), US East (Ohio), US West (Oregon) and EU (Ireland) with support for other regions coming soon.
算是個開頭... 不然以前都要自己搞 High Availability 的 site-to-site IPsec tunnel。
With just 12 ms of round-trip latency between US East (Ohio) and US East (Northern Virginia), you can make good use of unique AWS features such as S3 Cross-Region Replication, Cross-Region Read Replicas for Amazon Aurora, Cross-Region Read Replicas for MySQL, and Cross-Region Read Replicas for PostgreSQL.
其中有個特別的地方在於 us-east-{1,2} 之間傳輸的費用會以 Inter-AZ 計費，而非以跨 region 計費。大概是希望讓大家有動力多放些東西過去，畢竟 us-east-1 實在太大，穩定性超有名的關係 XDDD：
Data transfer between the two Regions is priced at the Inter-AZ price ($0.01 per GB), making your cross-region use cases even more economical.
