On the Android Device Dashboard there is a report where Google displays the different screen sizes and densities of devices that access the Android Market. The Large category is currently blank, but look for more big screen devices like tablets to be officially supported in Android 2.3. This means we could see more 7-inch tablets like the Galaxy Tab (1024 x 600) get certified and maybe a few other resolutions for the new smartphone displays that are rumored to be coming.
We have also heard that Google might relax the rules of their Compatibility Definition Document and allow non-3G devices to be certified. No WiFi-only devices have been certified to use the Android Market yet, but Android 2.3 should hopefully change that.
In a somewhat related note, I believe this is the reason the WiFi-only Galaxy Tab was delayed till next year so that Samsung could make sure that Google allowed them to ship it with the Android Market.
