IDG Answers is a community of experts who are passionate about technology. Ask a question or answer one below.
It’s a more significant update than the Andorid 4.4.X updates. The main thing most people will notice straight away is Cortana, Microsoft’s version of Siri. They have also added “Action Center” which let’s you swipe down from the top of the display to view notifications and toggle things like WiFi on and off...pretty much like Android. Swipe-style typing is added to the keyboard. The Store app has been heavily revised.
If you want a thorough rundown, Ars Technica has a 4 page article about Windows Phone 8.1