[{quoted}](name=Blaiz Fenix,realm=NA,application-id=6kFXY1kR,discussion-id=xA9Mr4FH,comment-id=0000,timestamp=2018-01-14T18:26:24.633+0000)
Historically speaking, hype trailers like these are not canon.
True, however none of the ancient trailers are correlating with the new lore.
Graves, Rengar, Leona, Jax and Ahri teaming up against Darius, Draven, Katarina, Zyra andNautilus makes no sense, as they don't know each other and all live in different places in the world (except Darius, Draven and Katarina but still, lore-wise it doesn't match).
The old trailers took place in the Summoner Rift and the Crystal Scar, which also aren't canon anymore (at least in the fighting arena context).
This time, all the sequences are events that can potentially happen and that match the lore.
Yasuo is actively searched and hunted for being the potential murderer of a Ionian Ancient. Seeing an army fighting him seems logic since he somehow is a national scale criminal.
Taliyah fighting Xerath may happen since both have powers and live in Shurima.
Ekko is known for making trouble in Zaun, and since Blitz's lore is not updated yet, anything could happen between them.
Mf is enemy with GP, and since GP and Illaoi have a known relationship, they may both be allies, leading Illaoi to fight MF (even if, let's be honest, MF doesn't stand a chance against her).
Lucian is searching Thresh to kill him and free Sena (or at least her soul), so a confrontation like this will happen at some point.
So I think we can assume that these MAY be canon (until denied by Riot).