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BFB: for now, probably not, but the webcasts on the topic made it clear we would have to support it at some point once RIM provides the full SDK support for doing it, possibly after launch.
What that means is that it behooves you to support it now as much as you can, though it's not yet required, and at some later time you will likely *have* to release an update that adds the required support.
Presumably certain types of app may not have to support the keyboard model (maybe some games?) but we have no details on any of that yet.