It's a class based on stances.
Are you saying a class based on stances will have no options for improving stances?
Really?
Now that would surprise me.
Yes, I'm saying that there won't be any feats, items that boost stances (except for maybe a Knight-only feat to get an extra stance).
As I said, for a Knight there is no difference between "get this bonus while in a stance" and "
always get this bonus".
So there is no need for the kind of feat you describe.
That's my point, the feats wouldn't be generally for a specific stance they would boost them in general. Hence the original fighter grabbing them to boost his daily stances. Especially in paragon and beyond when the fighter gets a good selection of them, making boosting stances worthwhile.
Ok, let's assume the unlikely. Essentials comes out and there is a Paragon feat
"Gain a +1 feat bonus to AC while in a stance".
* For the Knight, that feat is as good or bad as Plate Specialization. He's always in a stance, he's always wearing plate. Plate Spec has a prerequisite of Con 15, but it's safe to assume a Knight will have that.
In fact, all Knight stance feats need to be balanced to flat bonus or always-on feats, because that's what they are.
* For a PHB Fighter, the feat has an added cost that he needs to always be in a stance. Unless he has one of those encounter stances, it's a useless feat. (Wait, stance feats are worse for the PHB fighter? What are we panicking about again?)
And like the Knight, he can just as well take any of the armor specialization feats.