Didn’t they just release beta 3 like two weeks ago? Time flies I guess. According to reports, a bug that caused messages (not clear if this refers to Mail messages, or text/iMessages) to show a failure notice immediately after sending appears to be fixed. There also appear to be problems with the Bluetooth stack since 32-bit apps do not seem to function properly on 64-bit devices such as Apple’s all-new iPad Air and the iPhone 5s. The iOS beta has been released alongside Xcode 5.1 beta 4 which supposedly received a significant number of updates. Among those, Interface Builder has gotten a number of tweaks and performance improvements, including a decrease in CPU usage and system memory utilization when drawing storyboards on Mac OS X 10.8. If you aren’t a developer, this may look like gibberish, but what you should take away is that Apple still seems to be on-track to release iOS 7.1 (and Xcode 5.1) in March as scheduled.