A Japanese release list posted by Sega contained a little surprise before it was pulled. An HD collection of Yakuza 1 and 2 for PS3.
The list, which has since edited and reposted to remove the collection, showed a December 1st release for the package, with a 5,229 yen price point (or $66 USD). Yakuza 5 is also due for release in December in Japan.
It's likely that Sega will announce this in the not-to-distance future. With Sega's recent attitude about releasing games that aren't sure-fire hits, maybe don't get your hopes up for a North American release.

