I think they'll address it, but not in sync with the book's story line. They already made changes to make Bran's story line more interesting. The surviving Nights Watch traitors and Coldhands meet were suppose to do battle at Crasters. Coldhands leads Bran to the greenseer, so it's a critical character to omit entirely. They also omitted "warging" between Ned Stark's children and their direwolves. Bran is seemingly the only one that can do it so far.

bran wargs into hodor, and hodor/bran breaks free and helps bran, jojen and meera escape before jon shows up. that way they never meet as in the books.

although the preview showed jon et al attacking those at crasters keep, so hodor can't do too much damage (would be nice to see him wreck ****!).

i agree we need to see more warging. definitely been glossed over in the show compared to the books.

To me it is strange why we haven't seen Coldhands since any actor could play his part, but then again we have seen his ravens. I am just worried that they won't include him since he is one of the most intriguing characters for me.

I also liked when when Arya was semi-warging with Nymeria in the books, so that is a bit disappointing that it isn't included in the show.

Well, at this point, it doesn't look like we'll see Coldhands after all. The producers are probably hesitant in adding more characters to follow. They also want to create more screen time for major characters. If you think about it, even Dany's character hasn't seen much screen time this season.