According to the Adobe's definition, LiveCycle Data Services ES2 module is a scalable and optimized framework that abstracts the complexity of creating easy-to-use, personalized, and interactive applications. It includes a rich set of features that streamline the development, integration, and deployment of rich Internet applications (RIAs).

Adobe LiveCycle Data Services 3 provides significant new capabilities, including the following:

- Support for model-driven development of Flash applications, which make application development better, faster, and easier
- Secure and scalable connectivity across the DMZ with the Edge Server.
- New capabilities for developers to control and measure the quality of service of enterprise applications.

All the documentation is ready and available online:
LiveCycle Data Services ES2 version 3 Docs

You can download the LiveCycle Data Services ES2 free developer edition.