In the video, Mark Rubin (Executive Producer at Infinity Ward) talks about the pointstreak system in Modern Warfare 3, and how it differs to the killstreak system of past games, specifically Modern Warfare 2. He explains that instead of just rewarding the player who has a high kill-death ratio, all players can be rewarded for their actions.
Micheal Condrey (Co-Founder of Sledgehammer Games) talks through the various strike packages, describing the Assault Strike Package as being good for the player with a high kill-death ratio, the Support Strike Package as being good for the team player. The Specialist Strike Package is much different, instead of unlocking the traditional UAV or Sentry Gun etc., the player unlocks perks, and by 8 kills, you have every perk in the game. Mark Rubin likened this to a fighting game, where you have a charge meter on the bottom which fills up as you cause damage.
Micheal Condrey reassures us that this is "more balanced than it's ever been before", and that this game is now much more tailor-made to the way you want to play it.
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Note: The Specialist Strike Package is not unlocked until level 80.