I think point streaks and kill streak will be 2 different things.
Killstreaks, will be the same as we know. Kill x amount of people with no deaths and you get your set killstreak. Be it what ever number of kills they are.
With this new sighting of point streaks, perhaps they two are related. Robert Bowling has stated that they will be rewarding people that stick to the objective during objective type games be it Domination (flag captures/defends), Search & Destroy (bomb planting/defusing)etc. So say for each flag you capture, every bomb you plant or defuse, goes towards some reward, say that of a killstreak like reward.
In the video it was a Juggernaut pointstreak. It could be increased health for a certain amount of time. Now if that were true, it would be insanely overpowered. But remember, Robert has said that they will be rewarding people for sticking to what the game type is meant to be. Too many people now, will go on Domination, S&

etc and just get kills, while only a couple will go for the objective. If this was implemented, it would change the game play to what it's meant to be.
But what about Team Deathmatch and Free for All you say? Well, the only way I can think of it right now would be the point streaks would be earned from assists or avenger type kills
This is all speculation that I'm throwing out there. Take it as you will, but as far as I'm aware, it is NOT CONFIRMED!!!!