This all just guessing, but they are saying that predator missile like killstreak will be called the "Arch Angel." "The real name of this missile is the
BGM-71 TOW, as confirmed by the creators." When I was in basic training we had very basic training on the concept of this weapon, but I never actually got to see one. As far as I remember it's similar to what MW2 has now with the Javelin except that the TOW missile can be guided. Think of it like if you had the Javelin up there, shot the missile, and then were able to stay scoped in while you guided it around. If you played Bad Company 2, it is like when you get on those Anti-tank missile's, launch it, and then bend it around wherever you want to go.
Also, there will be a new killstreak that they are calling "Napalm Strike." You can see it at around 1:03 in the MP trailer. It's like a streak of fire across the ground. I didn't even notice it at first.
Again, though, it's all a guess, which they are picking up off the trailer.
As far as the RC car goes, it definitely looks like it blows up. If you watch the few frames before it switches to the next clip you can see that he gets a hitmarker.
Some more digging around looks like the SPAS might come with some incendiary rounds that they call the "
Dragon's Breath."