I don't know about you, but I was wondering if the single player would keep being able to mod your weapons like the first well my question was answered.
"when the best time is to swap out an ACOG for a reflex scope on the fly (which you can do with a few simple button presses)." you can read the full hands on here.

http://www.gamespot.com/ps3/action/crysis2/news.html?sid=6285425&om_act=convert&om_clk=picks&tag=picks;title;1&mode=previews

Had some nice hints on the storyline