I think it's fair to say that the speed increase is at best very moderate, but I don't believe the footage here is sufficient to demonstrate that there is no speed increase, because if the acceleration is very minor, you can't really tell by eye. We'll have to wait for more information.
I share the skepticism with others about why have a sprint animation if it's purely cosmetic? I know this idea has been thrown around before, but pretty much always tongue in cheek because everyone understands that an animation with no gameplay purpose is pointless. I also feel like, if I were a sprint fan (and an actual sprint fan can correct me if I'm wrong), that this would feel extremely patronizing, as if I couldn't tell the difference.
i am a sprint fan and you remember the humongous thread where it has showing that about sprint mechanic that the communety is split about it in the halo game's.
that removing or staying like it was in halo 4 and halo 5 was also no option.
what there have showing in the campaign trailer is something there have found a good belance in.
and i think that a lot off sprint fans are all happy that its 5% faster then normal walking or its cosmetic since there for then its not a shooter game without sprint there know from other shooters there have play.
and its also good for the new players.
but what also for most off the players is a problem if its a cosmetic part to keep both side's happy is that some still hate it and wane see it gone for good that its maybe cosmetic or not there not wane see it in the game that thats also something you maybe have read on the humongous thread about sprint.
if its cosmetic or not thats something we only know when the game is release to see it for own eye's or 343 most tell the info about it if its cosmetic or not.