Take note, video app developers: your Android app should have Chromecast support by now. It just makes things so much better for everybody. Video site Dailymotion knows where it's at, because the latest version of the beta app in the Play Store can now stream to the Chromecast. Better late than never, huh?
Other than Chromecast support and the usual bugfixes and performance tweaks, there doesn't appear to be any other significant changes to version 4.1.