I suspect the Bonus disc is simply the extras disc rather than something new.
I got the ITunes copy ( already have the Blu Ray without features ) and watched the extras. The Documentary is good. The rest of the stuff is just filler. The Deleted scenes, **** me ! Don't bother, close to insulting given what is well documented to have been cut. The cut scenes are not even full cuts. They are generally part scenes that add sod all.
The Special Edition can't come soon enough as this is generally poor.