Update: Back up but not very speedy. They will continue the sale for an additional day
Google-owned website down because of heavy traffic likely due to their Moto X Cyber Monday deal.
Our website is down due to traffic & we're working quickly to restore it. Watch here for updates & for when our Cyber Monday deal starts.— Motorola US (@MotorolaUS) December 2, 2013
Interestingly, it appears to be a front end issue because http://www.isup.me/motorola.com.