To be truly enterprising and capitalize kills on the new map, I suggest going with trap ops like Kapkan..or Frost. But I like Kapkan!
Nobody knows the new layout and you will get many traps early off. Especially Kapkan!..he rocks and you will blow many meany, solders with him off the early release.
Peppering a wall with bullet holes can be a good way of covering certain areas. Like when I'm defending garage in house, sometimes I will just stay in laundry, figure out where in that room I want to camp at and pepper the walls facing stairs and gym with a nice uniform row of bullet holes at heights that allow me to use those little bitty bullet holes to see if anybody is creeping up from either way. Works great on the stairs coming down from back door.