I bought my kit earlier last week and so I emailed Mike to ask what the changes were. He tells me that they are moving to a single board design so that they can sell the remote rig ready built, but that the functionality remains the same. He said that they are working on a new firmware realease with new features that with work with both old and new boards.
I hope that Mike doesn't mind me paraphrasing our email exchanges, but I hope to put minds to rest.
Steve