My mistake. Cloud isn't over looking Midgar... Lookie
https://hometown.aol.com/littiemaster/Clipboard11.jpg
Appears to be Midgar. On the left we have the Sister Ray, and on the right the ShinRa tower. At this point in the trailer Cloud actually says, "I want to be forgiven, but I can't forgive myself." He feels guilty for something. That death place is also the grave of Zack, and the sword that's stabbed into the ground is Zack's sword, which hasn't been used in years.
https://hometown.aol.com/littiemaster/Clipboard07.jpg
Someone noted on their site this discovery. Cloud isn't wielding the Buster Sword anymore. It appears to be a very wide sword with a sharper edge.
If you look closely at this next image, you'll know why it might NOT be Sephiroth, but some genome soldier related to him.
https://image.com.com/gamespot/images..._screen008.jpg
Anyone who knows FF7 knows that Sephiroth didn't fight like that. He wielded his sword straight with the blade towards the inside of his hand. This gent fights with the sword backwards, similar to a middle eastern type of sword fighting.