Live from TechEd Europe 2012 in Amsterdam, Jason Zander announced that the LightSwitch HTML Client Preview will be available 26-June-2012 10am PST for MSDN subscribers. Then available publicly on 28-June-2012. The LightSwitch Developer Center Team Blog and forums provide more details.
LightSwitch HTML Client installation
The download unzips to a VHD with a Windows 8 image and the Visual Studio 2012 RC with HTML Client is pre-installed.
The ‘ContosoMove‘ sample application is located under the documents of the ‘TestUser‘ account. We enabled Hyper-V in Windows 8 and created a new VM using the supplied VHD.
Adding a New Client
There can be one RichClient Desktop client and one or more MobileWeb clients added to the LightSwitch projects. The most notable difference in the IDE is the way navigation is configured and the screen snapshot above shows the screen content items have actions in the property window.
So the sample screens are running and there is plenty of testing to do.