Update: As of this morning the page that had the EOU update is now offline. It is very possible that it went public a little too early. I suspect it will be back online in the next 24 hours as the console is released.
However, before any activity can even happen on the sparkling new console one key maintenance task must be taken care of – the installation of the required Xbox One Day 1 Patch.
The 1.24GB patch could take a while to download directly on your console especially considering the millions of others who will be connecting to the Xbox Live Network to do the same exact thing.
So Microsoft has an alternative for you – download the patch now while you wait for your new Xbox One and then install it via USB instead of downloading it on the console itself.
The entire set of instructions are over on the Xbox One Emergency Offline Update (EOU) page.