I don't know if this suggestion idea is in the works, but currently, there is no voice acting when starting up Co-Op matches. Back in INS and DOI, there was one guy who basically annouced what to do. INS's starting speech was bland, but cool to hear before the round starts, and DOI's starting speech had character that entertained me a bit.
If this is not planned for the final release of INS:S, please add a couple of voice lines when a Co-Op match starts. I really like the voice acting in the sequal, and it'll be cool to hear a colorful short speech before the match begins.