If you're using auto renewing subscriptions, iTunes connect just got an update to give you access to revenue and other statistics for them. You can see trial conversions, cancellations, refunds, retention rates and there's a promise that more stats will be coming over time. If you're trying out subscriptions for an app, this'll be welcome news!
I had completely missed this, but I checked and it was announced at WWDC and now it's available. Basically, this allows you to completely remove certificates from your APNS authentication process. This makes the implementation of push much simpler, and of course there are no more certificate renewals! There's some documentation available if you want to get started with it.