Oh yes, something DID change. The hack that used the dock does NOT work, period. The permissions were changed by the update and the files are inaccessible.
I can confirm that Google Voice somewhat works with this device on Sprint.
I had a number on an actual line that I *28 to my GV number prior to moving to the Tab.
So, when I moved to the Tab and call the number, it goes straight to my *28 GV number.