We could redirect m. to ...
* the current
www.wikipedia.org, which seems to work pretty well on the smaller device screens
* send users to the main page of the user's default language - based on the browser settings (Accept-Language header) - and later possibly even based on user's own language prefernces
* ...
Obviously it should be similar for other projects like wikinews, etc.
I am not a big fan of building a full blown page at the m. URL, as that would involve much more work without a clear benefit - there are already www and main pages available, why build another one.
Thanks!
--Yuri