I looked at that but it just seems to be telling me the same thing as the June preview's release notes did. I want to know what's been changed/fixed/added since the June preview.
The developers would have to answer this. If you have installed Tools in a Linux guest you can upgrade them them without problem. Don't know if that gives yo anything new.
You should definitely try out the WSX update - major changes have been made to it.
The Player UI continues to be updated, including the ability to select a specific adapter for bridged connections.
Protocol improvements have been made to enhance the experience when connecting to a remote host
Otherwise, we have been making hundreds of stability and performance tweaks.