I just heard back from Nokia:

"Thank you for e-mailing the Nokia Care Contact Center.

We understand your request with regards to the repair/replacement status of your Nokia 770 Internet Tablet.

Our records do indicate that your tablet cannot be repaired as you have stated. However, at the present time, your tablet will not be replaced by either the Nokia N800, or the Nokia N810 Internet Tablets, but with a Nokia 770 Internet Tablet."

Bummer. I wonder where they're going to find a 770 to send me.