|Support for custom resources||
Custom resources are special AWS CloudFormation resources that provide a way for a template developer to include resources in an AWS CloudFormation stack that are provided by a source other than Amazon Web Services. The custom resource provider can be either a template developer or a separate third-party resource provider.
Information about custom resources is provided in the following topics:
|Support for provisined IOPS for Amazon RDS instances||
AWS CloudFormation now supports specifying provisioned I/O operations per second (IOPS) for Amazon RDS instances. You can set this value from 1000–10,000 in 1000 IOPS increments by using the new Iops property in AWS::RDS::DBInstance.
For more information about specifying IOPS for RDS instances, see Provisioned IOPS in the Amazon Relational Database Service User Guide.