It's almost surreal to me that Sega decided to announce a localization before they get any numbers on 5. Don't seem like the conservative approach they tend to have these days.
Anyway, Yakuza 0 is easily the best looking game in the series, it's awesome how good the artstyle is, which is one of the reasons why I'm slightly worried about 6 since that tease with Takeshi Kitano simply didn't look as good. As far as gameplay goes, the real time style switching allow the devs to make both Majima and Kiryu much more mechanically engaging and create a combat system with much more flow since the fighting styles aren't migitated by several different characters, which reminds me a lot of Devil May Cry.
Fuck, I really want this game. Those assholes better announce a European release soon.