I realized I left off one trend seen at NAHBS and to a lesser extent also at your local bike shop. Here is a hint. These pictures are not mountain bikes.
Yes, disc brakes on road bikes are coming and in custom bikes it is a common option. I am considering it for a light touring/long distance bike. Largely because I also pull a BOB trailer for more fully loaded touring. With the extra weight I think the stopping power of discs even in wet weather make a lot of sense. But to be more self sufficient while touring, I will probably go with mechanical disks rather than hydraulic.
Plenty more from NAHBS to come.