Also: no, I didn’t mention this just because Bryan Irace, Tumblr’s iOS engineer, listened to my feedback.
The next great new perk is a clever integration of your iOS Cameral Roll and albums into the actual camera. I’ve never seen this before: at the bottom of the camera is now a scrollable row of your latest photos. Swipe up on that area and you can quickly pick a saved shot. For bonus points, if you start a Video Post, this Camera Roll Bar (stop me if you know of a better name) filters out everything from your roll and albums but videos.
Tumblr for iOS is free in the App Store. It also retains the crown for being the best first-party blogging app by a mile.