You're both right. Hair is more trouble than its worth. Life would be easier without it. Unfortunately, some of us would make very ugly bald men. I count myself in that category, though for the record, I'm not as bad as that guy up there. No one could possibly be as bad as that guy...
As for the trailer, I'm very interested to see what Valanice's secret is. My only guess is that somehow she was involved with this evil. Or her family was. It turned bad, so she got locked in the tower. Interestingly enough, Hagatha wasn't the one locking her in the tower. It was some guy (or woman) with gray hair. Almost looks like a judge's wig, actually. Oh, and a troll. It also looks like there was a troll there. But no Hagatha. So there's definitely more to the story here.
Also, that green woman who I've been convinced is Hagatha is floating in the trailer! That seems weird. Now I'm wondering if it actually is Hagatha, because Hagatha never really levitated before. Of course, Hagatha's never really been more than maybe six colors before either, so who knows. My first guess is that it's Hagatha. My second guess is that it's a new character, possibly something like a banshee, and it's blocking Graham's way to somewhere important. Maybe that ginormous tree that's also in the trailer.