(I used mediawiki-l instead of wikitech-l list...)
We are at the end of the first phase. Brane Jelisavcic finalized Zhengzhu's work. It is working now on http://conversion.vikimedija.org/ (using MediaWiki 1.5rc4). If anyone has some questions about that, please, ask it here because Brane reads this list.
We want to implement this extension on Serbian Wikipedia. What should we do for that? (I.e., is it enough to ask here, or we should ask for it somewhere else?)
After the implementation of this part, we would start to work on the next phase (read-write access to all variants).