As Special Ops in MW3 has it's own ranking system you may unlock call signs in there however, they will not transfer over to the actual online lay as the criteria to unlock them is different.
Of course. How could they forget the PC gamers?
Of course. That would be ridiculous otherwise.
Practice
nope
Yes, you can play Modern Warfare 3 on PC.
No you can only play mw3 on xbox 360 (and pc and ps3 of course) not on xbox.
Yes
Yes, you can i did it in the last level of mw3
Mid August on [s3 and xbox habe it now for pc pc is september
you can't change it
Any version of MW3 is compatible with the COD Elite program. It doesn't matter if you use Xbox 360, PS3, or PC.