Time Capsule and USB HDD

Thinking of pre-ordering Time Capsule and wondering if anyone has used it or knows the answers to a couple of questions:

1. Is the USB port USB 1.1 or USB 2.0 (can't seem to find that info anywhere on the net)?
2. Can Time Machine be configured to use an external HDD attached to the USB port on the Time Capsule (would seem to make sense that it could, but can't find the answer anywhere!)?

I ask because I have a large external HDD currently storing Time Machine backups, but would like to use Time Capsule's drive (probably the 500GB version) as media storage, with the external drive able to backup desktop & laptop.

Anyone know? Thanks