New sounds for a lot of different guns.
New menu sounds.
New reward sounds.
New graphical icons.
New animated icons for reviving and patrols.
That much audio accounts for a large portion of the file size. The rest I'd speculate is paving the way for the upcoming DLC.
English
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Also, the average song is around 3-5 megabytes. The small audio they added would be nowhere near that size.
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3-5mb song? Only if it's a crap short radio edit and in inferior mp3 format. For real sound quality you're looking at around 10mb per minute of material. Just sayin' lol
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Dunno for sure man, certain parts look different to me. /shrug