It's not clear in the press releases, but according to the QNAP forums, the new BT client will be available for older models too in a firmware update, including the TS 101 and 201 as well.

I have the 209Pro and it's amazing. Built-in torrent works great, you can even remote access it over the internet, start torrent downloads from your workplace so that they are ready by the time you get home. I've got mine mirrored with 2x1TB drives. Pretty quiet, doesn't heat up.

.... and i'm very happy with it. The torrent engine could be a little better (you can only specify sharing time not a sharing ratio) but it's still a work in progress. Great for streaming divx to the XBOX360.
I got mine from the states for the grand total of 271euro including delivery (the weak dollar pays off!)