Meh. I know they're working on three more kingdom hearts titles right now.
Kingdom Hearts 358/2 Days (DS)
Kingdom Hearts Birth By Sleep (PSP)
Kingdom Hearts Coded (mobile phones)
Personally, the only one I think sounds interesting is 358/2 days, which works perfectly, because I have a DS.
![Cheesy :D](https://www.kumoricon.org/forums/Smileys/default/cheesy.gif)
It's also the only one that has officially been announced to be released in America, though the others are planned to be released in other territories that haven't been stated yet. ^^