There is one thing you should be aware of before updating WordPress for iOS on your iPhone or iPad. Automattic reports that:
Some users are reporting an error message related to login information after installing this update. If you get an error message related to your username and password but are sure your information is correct, please remove the app from your iOS device and do a clean install. Be sure to convert any Local Drafts to online posts before removing the app. We apologize for any inconvenience this might cause. We are working on a 2.6.1 bugfix release to be submitted soon.