Rituals
I'm still hearing the "it's primarily a tactical minis game!" complaint a lot around here (here=irl, not enworld). The background stuff is nice (eladrin city, blah blah blah), but what's we're really missing is solid game functionality for out-of-combat character abilities. With the rules we have, rituals are a big part of that -- but there's so few of them in the PH.
So I'm really glad to see this article, and hope there's not only a dozen good new ones but also that it's just the first installment.