Shocking.
I recommend that the bonus to AC be a Shield bonus, representing the fact that the gauntlets are strong enough to block incoming blows - they're basically as good as a buckler or light shield. You should also think about assigning them arcane failure and an armor check penalty.
Ah, but since this is still in the planning/design phase, it isn't current at all.Just as the pickiest of nit picks, if it's a current, then it is, by definition, not static.
Make it a shield bonus because it forms a forcefield. Like the Shield spell.
Build a character using it, and we'll find out.
If you read my description of the gloves, you'll notice that it has little separations so has not to hinder dexterity or quick somatic spell movements. Think something like this, in regard to the separations.
As for making it a shield bonus, maybe, but I designed it not to take up a shield slot. Of course, this is homebrew, so anyone who used to could change it.