The new Receiver for HTML5 1.0 can now be downloaded from www.citrix.com.
Receiver for HTML5 1.0 integrates with Access Gateway and StoreFront to enable users to access desktops and applications provided by XenDesktop, XenApp, and AppController through HTML5-compatible Web browsers without the need to install Citrix clients on their devices.
Online documentation can be found here.
Download the software here (requires MyCitrix id).
Known issues for this version can be found here.