AWS Service Catalog Introduces Support for YAML-formatted AWS CloudFormation Templates

You can now create Service Catalog Products using YAML-formatted AWS CloudFormation templates (YAML Version 1.1) in addition to JSON-formatted templates. This allows template creators to choose the format they feel most comfortable working in to describe AWS infrastructure. YAML-formatted CloudFormation templates follow the same anatomy as existing JSON-formatted templates.
Quelle: aws.amazon.com