User blog comment:Dodo8/Leaked Vehicles in GTA V/@comment-2099017-20120802004643/@comment-4215051-20120802015841

Don't lose hope, if this list is even true, it's not complete. You should've noticed there were more planes in the trailer, and there is only a few listed on this list some of them not even the ones in the trailer. Also, the Sentinel is most likely that blue convertible, and possibly the Oracle(what the Sentinel would be in GTA 4 but R* decided to make the Sentinel it a coupe) is returning.

As for the Stallion, I also doubt that's being cut.