This is in no way confirmed. Take this story as nothing more than speculation for now.

The rumor of Sonic in the new Smash Bros. has been going on for a long time now. This time it's a little different. Reader Alex sent me an email telling me that Swedish Nintendo magazine +N is reporting Sonic in SSBB as a fact. He even grabbed a scan of the article in question.

Basically the article states who we will be seeing in Super Smash Bros. Brawl, and they include Sonic in that list. Speculation by the magazine, or do they know something that we don't?