IGN recently posted their big FAQ/Guide on Brawl. It's basically posting info from the SSB Brawl website but with some extra additions (like a brief history of SSB and such).
What intrigues me is the Q&A part. One of the questions goes like this:
Wi-Fi, or no Wi-Fi?
Question: Will Super Smash Bros. Brawl be online?
All reports indicate that yes, it will. Brawl has been planned from the beginning to be a flagship title for Nintendo's free Wi-Fi Connection service, and though the feature hasn't yet been 100% confirmed, you can rest soundly in the knowledge that it's an almost surefire guarantee.Either they know something we don't or they are speculating because online mode was still up in the air, specially since they came out and said that they had online mode running perfectly in duel mode but were having problems running 4 player battles online.
Man, I wish Nintendo would just come out and confirm/deny Wi-fi mode.
You can read the rest of IGN's FAQ
here.