Harmonix has finally announced that Dance Central Spotlight will be available on September 2! I’ll post the rules and registration details as soon as possible!!
In the meantime, you can take a look through the DC3 countdown submissions for some inspiration.
On another note, DCS Countdown’s Rules & Regulations as well as Registration Form will be available in Japanese and Chinese for the convenience of non-English speakers who wish to participate. Also, if enough people request for other versions, I’ll open a position for translators.