A Getting Started Guide walks through using and modifying a form, and highlights many of the capabilities of the 2.0 tools, including bi-directional sync with the server.
The 2.0 tools are in Alpha or Beta status. We are referring to the combined set of tools as the "rev 122" software. To understand what we mean by the Alpha and Beta designations, see here
The rev 122 software works with the just-released ODK Aggregate v1.4.4.
Known limitations of this software are described here.