There's a closed alpha of Titanfall going on. It's closed, which means people aren't supposed to be uploading video of it, but you know, the internet.
UPDATE 2 - Both videos are now down. Sorry!
We've got two videos below, one directly-captured, the other taken off-screen. Both give a pretty good idea of how a standard round plays out.
Players drop onto the map, then run around shooting bad guys. So far, so Call of Duty. But then you notice the changes. There's loads of AI-controlled opponents out there. You can do fancy jumps to get you across gaps in the map.
And then, in both clips, a Titan gets dropped. And things get crazy.
UPDATE - The second video has been pulled. First one is, at time of update, still available.
The first clip below is the better one. Start at the 0:40 mark.
TitanFall Closed Alpha Gameplay [Off-Screen] [xJumPeRJumPzZ]