Me too. I can't wait for mine. It shipped yesterday, and scheduled to arrive on wednesday.
However, I found something even better than these while I was waiting. It's a wireless flash drive that works while in your pocket or on your keychain, without having to plug it into the tablet.
So it won't drain the Nexus battery, plus it leaves your microUSB port free so your Nexus can be charging while streaming movies from it! No internet or router required, but CAN be used via router also. It has optional password protection and 128 bit AES encryption.
Oh and it doesn't require Nexus Media Importer. It has its own official Sandisk app.
Sandisk Wireless Flash Drive
They call it a flash drive, but it's really not. It's technically a card reader. It has a slot for a microSD card and comes with a card already in it (either 16 or 32GB), but you can remove that one and replace it with a 64GB card.
PS: this thing works with BOTH Android AND Apple devices!