http://www.konami.jp/bemani/ddr/na/gs/sn/
Although not an exact date, but Fall 2006 is close enough. It reports of a "Link feature" being able to connect to the arcade machines, a steller master mode and of course, online play. The Japanese version has yet to be released and Xepher, a fan favorite, will be added to the mix as well as Innocence of Silence by popular demand from the crowds at E3 this past year. Much thanks to Juli for the link!
Edit 1: # Online Service for DDR Extreme 2 will be ending.
"We regret to inform you that our online service for DDR Extreme 2 will be ending on
September 12, 2006. The servers will permanently be taken down at this time, and users will not be able to connect to the DDR Extreme 2 online service after this date. We thank you very much for your continued support and understanding.
However, our new game Dance Dance Revolution SuperNova will feature Online play!
If you have any questions regarding this announcement, please contact Konami Customer Support at:
support@konami.com." Thanks to TyTyger for the info as well as DDRUK as his source.
Edit 2:
http://www.konami.jp/bemani/ddr/jp/gs/ddrsn/
Louie826 later found the japanese placeholder page. Look for more upcoming information there too!
Edit 3: Arimasen just linked me to this:
http://www.play-asia.com/SOap-23-83-...-j-70-2sz.html
&
http://www.aeropause.com/archives/20...violin_con.php
It's a violin rhythm game. Plug and play and operates from a battery or power supply. With a playable 4 songs, we're not sure if there's difficulty changes.