I don't know about you all, but I've been using Eventbrite for almost all of my ticket purchases lately. Whether it's a benefit show, a friend's play, or a full-scale concert, I find myself getting redirected over there more and more to pick up my tickets. That's why I'm glad to hear there's an iOS app on the way from the company, which will allow you to browse through recent ticket purchases and upcoming events, as well as get information for all of the shows you're registered for.
Unfortunately, the news doesn't mention anything about being able to buy tickets directly inside the app -- it's possible, because of Apple's restrictions on in-app purchase