There is some pretty good information available via the English pages of the Tokyo Stock Exchange website for the TOPIX futures (several downloadable pdf files for someone to browse).
I actually live within a mile of the exchange (live and work in Tokyo) so I have been waiting on the availability from IB. The only problems are charting and the short trading hours (for me during the day while I'm at work.) I'm sure you could use QuoteTracker with IB as the feed as one possibility. I believe that there are some local providers (haven't check in a while) but of course the software is in Japanese and although I speak/read at an advanced/intermediate level, my response time to any issues would be too slow in reading messages.
It would be nice to see eSignal provide data/charting with QuoteTracker as a good backup.