[CrimsonNataku]

Although not a huge Kingdom Hearts fan myself, I could probably become one... once I have the time to play the games ^_^; My sister finished both games over the course of a few days... So she's the bigger fan. I like the characters and story though.

Concerning Kingdom Hearts III, however...

Though not officially confirmed by Square or Disney, creator Tetsuya Nomura has openly admitted to having a plot for Kingdom Hearts III in the works and is planning to create it. However, he has stated that he is working on another title first.

This "another title" is none other than the Final Fantasy versus XIII for the Playstation 3. Nomura and the Advent Children and Kingdom Hearts teams are all working together to create this game, which will be one of three Final Fantasy XIII games. Once this game is completed, it is believed that Nomura will resume working on Kingdom Hearts III.

Furthermore, Tetsuya Nomura has openly stated in an interview that the characters (in the trailer) were not in fact Sora, Kairi, or Riku and were three completely new characters. This may not mean, however, that the three will not be present in Kingdom Hearts III; but if they are present, they are most likely not the main characters (given how neatly Kingdom Hearts II was tied off). Nomura has also hinted that characters from multiple Final Fantasy games, including XIII, will make an appearance (just like in the past two games). He has also said that the game takes place both in the past and the future, so it is presumed the setting of the game will be in an alternate dimension, different from Sora's world.

When, however, the game will be released is a different question entirely ^_^; It is almost certain though that it will be released on the Playstation 3, given that all three Final Fantasy XIII games will be released on that platform, and that Kingdom Hearts 3 will be created after them.

As for Kingdom Hearts IV, that is almost definitely a rumor. Tetsuya Nomura has acknowledged nothing of the sort, only the creation of Kingdom Hearts III. I have no solid information to back this up, but I believe after Kingdom Hearts III is released, that may be the end to the Kingdom Hearts series. I say this based on how the last game ended, the nature of the trailers, and what Tetsuya Nomura's statements.

I apologize for the long post, and I hope this is useful.