To quote the description:
The trailer gives brief glimpses of Connor using his newly found abilities (namely Wolf Cloak and Alpha of The Pack), and of course, some of the changes made to the landscape of ACIII. We even get a redesigned
kunai Rope dart!
All that and many other interesting things that would take too long to list are included in the trailer, so have a look.
Another thing not to be missed of course is 'Ol George rocking dual pistols, a POE, and of course; dat steed.