I don't think it can beat Modern Warfare 2. Simply for the fact that they are two different games. They have different feel to them. I also don't think BFBC2 will beat MW2 in sales rather, it will get tones of attention and huge sales. It's purely amazing (BFBC2). I am not saying MW2 is better than BFBC2, just saying that they are totally different.
Also guys, here is another video I made, pointing out small little details so you know what you will see in the game.
It's a totally different video with bunch of Pauses and captions. Trust me, you will know a lot more regarding this title. For example, what it's capable of, what vehicles will be coming, what weapons.. etc.
Here are Excerpts from the video.
0:23 - MP 412 Rex pistol
0:26- SV 94 Sniper Rifle
0:31 - Kill an enemy, 50 points
0:48 - T90 MBT Tanks also, M1A2 tanks
0:53 - Squad Assist, 40 Points
0:56 - M9-3
Also notice the sound difference when we enter the room after a squad assist and how it differentiates. I can babble a lot about the video, but I decided to provide images with excepts ... a picture tells a thousand words.
MP 412 Rex pistol 
SV 94 Sniper Rifle 
T90 MBT Tanks 
M1A2 Tank 
Enjoy!