In Japan, where they take arcades seriously and no arcade game is taken as seriously as Virtua Fighter 5, regular updates rebalance the game based on player feedback and add new features. The latest update, Rev C, has made the usual miniscule combat tweaks as well as adding a handful of new costumes. Here's hoping they're standard on the 360 version and that Xbox Live is used to keep the game up to date, too.
There's very little that can go wrong with this one. Even as a simple, straight port, it immediately becomes the best fighting game on the Xbox 360, hands down, no arguments. And with regular updates to look forward to, it may just keep that crown for a long, long time.