There are no major new features added to the Beta’s release notes, but Apple appears to have used iOS 5 Beta 5 to fix a number of preexisting features and quirks from previous releases.
Although many of the features were announced back at WWDC-2011, BGR reports the new software includes some hidden extra features, like the Nuance-powered speech recognition believed to be called Apple "Assistant."
BGR shares the log change and suggests that users can register multiple iCloud accounts to a single iOS 5 device, while wireless synchronization – which allows you to avoid plugging in via USB and instead sync with iTunes over WiFi – is now enabled to Windows users as well as Mac.
According to MacRumors, Apple attempted to disguise the Assistant codenaming the microphone button “forward delete key” and the new keyboard layout as a Dvorak variant.
Apple is yet to finalize the deal with Nuance, and as such the server-side processing is unlikely to be ready.