On April 24 (in Japan), Street Fighter IV will get the totally free "Championship Mode" update, bringing unique features to both the PS3 and the Xbox 360.
Replays, it seems, will be viewable cross-platform as well as "replay rankings". However, the PS3 is getting an exclusive voting system that allows players to vote for parts of the fight they thing are "Funny", "Awesome" or "Beautiful".
The Xbox 360, on the other hand, gets a couple interesting functions of its own: On-screen display of input keys and the ability to download replays to any media to the Xbox 360's HDD or memory card and then upload those replays for off-line viewing.
Not sure why both platforms couldn't have these features...
UPDATE: Previously we incorrectly listed that Championship Mode would be priced. This update is free, free, free.
『ストIV』で大規模アップデートを実施、新モード、新コンテンツが追加 [Famitsu Thanks Zappa!]