Has the iPhone 7 Plus finally broken cover on video?

Less than a week before Apple unleashes its 2016 iPhone flagships, the larger iPhone 7 Plus seems to have made a brief video appearance.
Sonny Dickson, who has previous form in the leaking department, posted a clip to Twitter seemingly showing a trio of working models running iOS 10.
It’s not clear who shot the video and it seems the Dickson may just be passing it on to the world. However, given he has a track record to protect, it seems likely there’s a degree of certainty here.
The tweet, which was accompanied by no text, appears below.
https://twitter.com/statuses/770991114656423936
Dickson was on the money with leaks for the iPhone 5S, iPhone 5C and iPhone 6 launches but has been a little quieter since.
Watch: iPhone 7 news, rumours and release date
Do you think this video is legit? Share your thoughts in the comments below.