I think Gav meant, when can we expect a 328 sold on a Duemilanove or a successor board. Since 'Duemilanove' means '2009', and it's now February of 2009, I would imagine the next reference design might be a while. Vendors might go through the trouble of swapping out chips, but that seems like an extra cost that they'd have to pass on to the customer. A lot can be done on a 168... challenge yourself and be patient, or do some extra work yourself if you really need the 328.