As Kyzak says, the info from Krinlabs is that bonus zones will be added online as Krin updates the game. First however, is the bug/glitch resolving phase, then Krin can start up on new zones and stuff.
IF Sonny 3 were to come out, it would come out in a long long time. Krin is going to be making Sinjid (it supposedly doesn't continue the story of SOTW, it's just a standalone) which is a similar web RPG kind of game, so you can look forward to that (Play Sinjid:SOTW if you like Sonny, I guarantee that you'll like that too).