Another kind of link is needed to use Wikipedia in epub format someday: links to a precise part/chapter/definition within another book in the same directory.
Such files are available in mobi format in several languages but they are not supported by the Hanlin V3. But the older files that contain Wikipedia in one big mobi file (around 300 MB) allow navigating through Wikipedia with links:
http://pinguinburg.de/wpmp
Since it is over for the mobi format, a nice goal would be to make epub's link support even better than mobi's.
And Wikipedia in the reader would be a nice advantage for the first ereader brand capable of offering it to customers.