Commerce Team Linden posted the following:

The Direct Delivery Beta on Aditi launches today [Jan 10, 2012] (Aditi is the Beta grid and testing will not impact production). If you would like to try out Direct Delivery please see the Direct Delivery Instructions and the Beta Release Notes on the wiki. These instructions include pointers to Knowledge Base articles and ways to provide feedback.

You can read the announcement and about users experiences in the SL Forum. Direct Delivery Beta Launch.

We may see Direct Delivery arrive in the first quarter.