You now have instant access to your camera and photo library from the editor. If you select an image in an unsupported format (like TIFF), WordPress will automatically convert it to a useable format before uploading.
There have also been improvements to the comments notification system. I’m still waiting to see how that works.
The mobile app is becoming quite an impressive blogging platform. No, I’m not ready to write an epic post using my phone, but I have done some pretty significant writing using my iPad and an external keyboard. I’m impressed.