Just got my CKN70's today, and I'm very impressed with them so far. Low end is much more present than the CKN50's, though it's a little fat -- hopefully this will straighten out with time (though if it doesn't, it's not a deal-breaker). Mids are reasonably forward, and the highs are typical A-T highs, nicely perched on the edge of crisp but not harsh or sibilant. Overall the sound is very full and energetic; the soundstage seems perfectly situated too (not too wide, not too narrow). And best of all, these follow in the tradition of the CKN50's and CKM500's of, to me at least, needing absolutely zero EQ to sound great. They come with the same tips as the CKN50's, which aren't horrible, but aren't great either (I put a new set of Complys on right away; S400's fit perfectly). The only real bummer to me is that they don't come in white.
Overall, CKN70's are winners. I haven't found an A-T in-ear that I don't like, but these are the best I've heard so far.