Ok, after watching this video carefully, now I am feeling confident to share my opinion.
The good parts come first. I like the UU, a lot, by all means at least they did use some mythical weapons from the romance of three kingdom (I am looking at you,Chu Ko Nu) nor child labour, but a excitingly brand new unit, with historical accuracy and fancy model. Also, Ying Zheng's UA suit him well, and the animation is much better than I thought.
Then we come to the hilarious part. I wonder how can Firaxis give a "protective" agenda to a warmonger tyrant, and his destruction on the Confucian knowledge is controversial to the science bonus of the "change of dynasty". I did noticed that now to some extent the leaders are separated from their civilization, but please, at least don't make it sound like a joke. A similar problem can be found on Hojo, is it really a good idea to give him a natural disaster as his UA? Well, if he was a wizard who summoned the tsunami, then yes, but he is not, at least we havn't find the prove yet.
Then, the naming of the Chinese UA. I don't know much about Chinese history, but when I am think of come Chinese feature related to science, I know I am looking for "four great invention" or "imperial examination", even "mandate of heaven" can explain the science bonus as the gift from above. "Change of dynasty" is simply against the intuition, in most of the time, as the result of the peasants uprising or natural disaster, or the mongols, it brought out more changes on the government system, ethic proportion and trade, not science or production.