In September last year, a list of “series 2” characters set for LEGO Dimensions was released, but each name had a code name, so there was no confirmation of who these characters actually were. One of the code names was “S1” which started speculation on whether or not this was going to be Sonic.
On Tuesday of this week, LEGO insider CM4Sci commented twice on a EuroBrick post, one stating “Sonic is coming”, and the second stating “I also know for a fact Sonic is in if that confirms anything.. else.” on the same thread.
This information hasn’t been officially confirmed, however Brick Enquirer advised in their original post that “within the LEGO community, CM4Sci’s word is about as good as it comes.”
Only time will tell if Sonic will join the line-up, but we will keep you posted with any official announcements.