Chill Zone (The Tavetaan)

I get where you're coming from but light spoilers are generally used to advertise games. CD Projekt, for example, did reveal information about locations and general plot for the Witcher 3 & the two major expansions.  Bioware may have traditionally shown more than that but not by much, DA:I was a complete oversaturation, but I don't remember the Mass Effect, DA2 or DA:O being particularly spoilery, character videos in ME2 were about the height of it.  

The amount of information people want about a game varies so much that it is difficult to get a balance, with both sides of the aisle saying it shows lack of confidence.  

Summary of what I've read so far.

IGN is spoiler free, mostly talks about combat, classes, exploration, a quick idea of the dialogue system and some issues the author had. Also mentions the name of one of the human squadmates, the name of an Ark and the name of the new Mako and new Normandy.
Gamespot has light spoilers around some of the characters and the types of things they say, not exact dialogue and on the very beginning of the game. Everything else is similar to the IGN article. Also gives a summary of the mission the author played, details of an area explored, the names of squadmates already released and their impressions of them. (both articles have this info)
Polygon is spoiler free but not very informative. The author compares it to the Trilogy alot.
RPGsite has light spoilers if you consider impressions of the dialogue system and characters spoilers. Impressions of the pilot and the doctor (who has had info revealed about her today). The video on this article does have some visual spoilers of environments and characters.

The new gameplay trailer is very focused on combat and how the levelling system works. Does have visual spoilers the main alien bad guys and squadmates. 
The new Voice Actor Video does contain some light story spoilers.

Hope this helps!

Edit: Adding some additional points as requested by shechinah .