Android phones, apps and tablets

The new Nexus tablets finally have multi-account support.

You can log out, and someone else login... and their apps, their preferences, their contacts.. all of their stuff is just there.

Then they log out, and you login, and all of your stuff is there.

Finally the missing feature on a tablet has arrived.

Is this going to come as a software update?

Or have to buy a new Nexus 10 to get it?