This email is announcing that all Auto Fulfillment of future versions will be delivered to you, by default, via electronic download - NO DISCs / DVDs / CDs will be sent to you. Unless you inform Autodesk that your delivery preference is that a box of discs be sent to you. How do you inform them? By login into your Subscription Center Website account and setting your your delivery preference to “box”.
I would suggest setting your preference immediately before the new 2011 versions are released.