First trailer before announce a game officially like this mostly made to see the raw artstyle ,unfinished gameplay etc.To see the whole picture of this game, just like what we see on TC trailers 6-7 months ago.(or older than that, something that they didn't show us at all.)
This mean they didn't much polished anything in this trailer yet ,same process as i drawing my comic.
1. Raw sketch - to check many things before start real work.(I gotta send it to my editor for approval first.)
2. Detail sketch - before final process.
3. Finish.
This's quite off topic, but i hope you understand what i want to say. ( ^_^)\
(Sorry for post a pictures that may disturb this topic.I think use something that i use to will be much easier for me to explain what i want to say in English.)
About this game, it too fast to judge what it will look like in final product.Look at The Conduit for example. :D