There are no snipers, only Light rifles. For the discussion about this, you should check these 2 topics:
http://www.gamesas.com/index.php?/topic/1112897-best-sniper-class/
http://www.gamesas.com/index.php?/topic/1157370-snipers/
While rolling is more realistic and seems more logical, they intentionally did not include rolling to avoid "motion sickness" and to be able to shoot at all times.
VOIP is available, an AI Squad commander announces the most important things. (F.e. Bomb planted at the gate) and there's probably some form of quickchat like ET:QW or W:ET.
I'm not sure if you can move it around, but you can probably turn it off for most part. (Atleast on PC) They were experimenting with different things like turning of HUD elements when they're not used for a while. I think they did not opt for this after testing, but they're open minded when it comes to things like this.
You can do pretty cool Stuff with the customization. Revoluzzer has a link to a picture of a customised mask. http://img833.imageshack.us/img833/2193/im26.jpg
Since you can play the maps in a random order, I wouldn't worry about it.