As far as my part, none, samsung puts out a large change list, you might have to search around for that., security receives an update always, pretty much and I know it did with this update, but there could be others in the system. As I no longer use this tablet myself I'm not likely to notice what has changed, so good if you or any of the other users could speak up. Often as the updates get to the end of the line from Samsung its usually tidied up the bugs, not that I was aware of any.
After you flash it its helpful if you can post how it went, as the one I have here is the wifi version.
This rom as always has been built from the T825 firmware though so could be slightly different in experience.
my friend these roms are really nice but i install these roms on my samsung t827 tablet without any problems but somehow the phone is not active can you be at this place ..? THANK YOU..