Looking at software, the Nexus 10 runs the newly announced Android 4.2 Jelly Bean, which provides plenty of new features like quick settings, more Google Now features, Photo Sphere, widgets on thelockscreen, the ability for devs to add maps into their tablet-optimized apps, a screen saver-style photo viewer called Daydream and a music explorer that quickly finds artists similar to the ones you're listening to.
If successful, pressing the power button again will bring up the home screen straight away, and what's more, thelockscreen won't return until the handset is restarted.