I hope the game has a good, color manual. Those are a dying breed now-a-days!
As an owner of strictly a US 360, I wouldn't be importing... I'd just wait for the US release. But it sounds like they're going for near-same-day releases with the 25th/27th dates mentioned so far (almost the same time, when you take into account timezones), so I'm not really worried about it.
Never get too hyped for SNKP release dates, lol. Look at how long it took Trouble Witches NEO! and 2K2UM to come out! Not even going to mention PS2 and Xbox release dates.
And as far as DBZ... that's a whole different market as far as I'm concerned. If they get XIII into demo Kiosk, I could imagine some entering the stores for DBZ, but walking out with XIII!