the first sign is the overly cinematic trailer. sure games have them but this one gives a cartoonish sort of story, that's how most p2w go.
the gameplay features way too unrealistic movement and/or the way weapons work gives it a heavy p2w feel. this is a dumb generalization though.
there are multiple characters featured as individual personas. instead of classes, it seems you get legitimate people as characters instead of your own creation. another thing p2w's do.
and powers you would never find in AAA games because they, at the time of preview, look way too overpowering.
this game isn't even released yet, so none of us can come to the consensus that this is all fair game, isn't p2w, etc. i'm keeping a neutral look here, i mean, it does look fun in some ways, and way too repetitive whoever-has-the-best-gear wins, p2w or not, in other ways.