Seeing as Sega has been very hands-off with the developers they've acquired, I don't know why people think they would put Atlus to work as their localization team. If they did acquire Atlus, recent history suggests they would just have Atlus continue to do their thing.
As for this game coming to the West, I'll be surprised and delighted. I would love to wander around in a nicely realized world of this setting. Sega should take a look at how foreign films are marketed in the U.S. Although the English voiceover trailers for Yakuza 4 were decent, there's really no need to try and disguise the fact that these games are in Japanese with subtitles. Especially for something like this upcoming game, which is clearly a period piece set in Japan. Just show exactly what it is.