I'm guessing he gets 2 or 3 games. Looked like a shoulder to head hit, but under the new rules, if the head is the principle point of contact - which it is in this case -, it is considered illegal. Looked a bit blindside too. Letang bleed, but didn't look injured. We'll see.
Letang had his head down. But patches should of definitely eased up or just push him off the puck. From someone who almost broke their entire spinal cord, he probably should advocate a little more safety in that area.
But you can tell Pac feeling like **** on the bench, so I don't think it was his intent to headshot Letang, especially considering the Chara incident of last season and simply because he isn't a dirty player at all.
Suspension? Maybe, but I'd need to see a better angle of the play to comment. RDS didn't give have any good camera angle.