According to Gamefront, the latest issue of Famitsu is reporting in their rumors section that Sega is planning a sequel to Ryu Ga Gotoku for the Playstation 3. No real details were given, of course, but the success of the first installment was more than enough to warrant a sequel.
source: gamersreports
"Ryu Ga Gotoku Sequel For PS3?" - 29.03.06