If you're an Android user, you may be really looking forward to Android 4.4 Kit Kat. It starts rolling out today to Nexus 7 (2012 & 2013) users as well as Nexus 10 users. I haven't received anything at this point, but I'm checking often as it will be fun to play with and get used to before my Nexus 5 arrives. According to Android themselves, the update is only for the WiFi Tablets and the 3G versions - as well as updates for the Nexus 4 will be rolling out "soon".
You don’t need to touch the screen to get things done. When on your home screen* or in Google Now, just say “Ok Google” to launch voice search, send a text, get directions or even play a song.
Source: Android G+