Hmmm...I'm judging based on the stills I saw at the link below. When it says "Killed" it looks like preset cards (barbwire, a dragon, etc.). Do you reckon those are custom?
I'm judging based on all of the other kill screens in the trailer. They're too dynamic and colorful to be preset.
The preset emblems, like the MW ones, are all detailed and pre-designed pictures, but the ones in this video are flat and look exactly like the ones that someone could create now in Black Ops.
I agree they don't necassarily look "as custom." Possibly just placeholders for the trailer, but a couple noteworthy things: If you look at :24 on the left side of the screen you'll see a player's card (Min2theMax, or something like that) and his emblem is exactly like DJVahn's at the start of the trailer.
I really enjoyed the ability to showcase our creativity, personality, and interests into out emblems. There were a few bad seeds in the whole ocean that would abuse the feature, but that's why there was a report system. I REALLY hope they bring it back and reinvent it because I thought it was one of the greatest things to come out of Black ops.