The studio responsible for Sonic Advance and Rush are working on the WiiWare title.
reveals that Dimps is developing Sonic the Hedgehog 4, according to
Dimps previously worked on the Sonic Advance and Sonic Rush series,
and the day-time stages of Sonic Unleashed.
The team, located in Japan, was founded by former SNK employees and
has also worked on Street Fighter IV, the Dragon Ball Z: Budokai
series, and the Japan-only DS game Tales of the Tempest.
Sonic the Hedgehog 4: Episode 1 is set for a summer release.