Thats awesome! Thanks for sharing, Ive been wanting to get a closer look at that motor for a while.
I really hope they increase the displacement though, Im pretty sure it will since I think 5.5 is the displacement limit.
So what we know so far includes..
improved variable valve timing
raised cam block
and im guessing piston squirters like the LS9 and DI 3.6
and improved combustion chamber design
which Im guessing is maybe somthing similar to what the LNF uses.