That knee to the head by Spezza looked deliberate and retaliatory, and I think he is getting 5 games or more for that attempt to injure for targeting the head.
Had it been any other Jet player in that position, he likely wouldn't have done that, but in this case it will be viewed by the league as payback. He will likely argue had the Refs done their part and tossed Pionk from the game for his dangerous hit earlier, that event wouldn't even have been possible. The fact that Pionk wasn't seriously injured on the play is likely going to help Spezza in this case.
Department of Player Safety FAQs - NHL.com
If the infraction might require
a suspension of six games or more, the offending Player is offered the opportunity to an in-person hearing. In this case, the Player remains suspended until the hearing takes place. If the Player waives his right to an in-person hearing, the hearing will be conducted by phone.