Although the spell selection is functional (you can put in the domain spells to fill the special domain slot), it's not showing the traditional +1 per spell level in the spell progression when the domain is selected like a cleric has with his domain spells.
At revision: 22503
I don't see any difference after the fix.
Well, short of rebuilding the class, I don't think I can affect it then.
We'll need a feature request to encompass the ability to add a Domain +1 to an Arcane Class.