I think that is something we'll have to look out for, because you're absolutely right that a phone plus bluetooth keyboard doesn't mean a good computing paradigm.

They've said that they've brought in a lot of keyboard shortcuts - for example for accessing the dock applications. It looks like they're recreating the Agenda app too, which was keyboard driven (the best bit was a pop-up month calendar with a press of tab, which folded out to three months then a year with repeated presses, which could be navigated by cursor).

On my android phone, a bt keyboard already has some shortcuts - like alt-tab to application switch, and I think the Windows key brings up the homescreen. You can get folders and files on the homescreen/desktop with 3rd party apps.