I have just updated Using Both Remote and Local Data in a LightSwitch Application for Beta 2. I reshot all the screens and have made some changes to both the text and the narrative. I also added a section on the code you need to write to enable saving data in two different data sources. In Beta 1, you could have two data sources on a screen and edit both of them by default. Starting with Beta 2, the default is that you can only have one editable data source on a screen. If you want two or more, you have to write a little code. I cover that in the updated post.
I am working on updating the rest of my posts for Beta 2. Stay tuned.