My guess is this Gauntlet has some link to the new CFM practice they have alluded to in E3 videos. I guess the training Camp aspect could be there too, given the tweet about more HC09 like features, we'll see.
Also am I the only one that looked at all those people/player models on the field in that clip and wonder if they can do that in M15, why couldn't they flesh out the sidelines more this year too? I'm not even referring to animating the entire NFL sideline this year but at least having every actual player, on each team, animated on their respective sidelines and coming on/off the field in real time. That can't be that difficult a request on these consoles, considering Madden 2000 on the N64 had players coming on/off the field.
https://www.youtube.com/watch?v=poGwpyd67YY