Amazon in its ongoing press conference has hinted at some improvements to the Kindle Fire software. It seems to be a completely new interface with great improvements to existing apps — or, in some cases, totally new apps. Over the past few days, developers have spotted that the Kindle Fire OS is now based on Android 4.0 instead of 2.2. It remains to be confirmed but the important changes seem to indicate that. Among the new features, Amazon has a completely new email client with Gmail, Hotmail and Yahoo support out of the box, a custom Facebook app in which, for example, you can share your book highlights and a custom Skype app to take advantage of the HD camera on the new devices.