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It has been announced that three new KH games will be coming! One for the DS, one for the PSP, and one for the mobile phone!

Kingdom Hearts: Birth by Sleep -- PSP Main characters: Terra, Aqua, Ven

Kingdom Hearts: 385/2 Days -- DS Main characters (not exactly sure): Roxas, Axel, Xigbar, Saix, and Mickey

Kingdom Hearts: Coded -- Mobile Phone Main character: Sora

more details to come. Visit IGN for more.

I just saw on Attack of the Show that they said they could expect these titles next year, but nothing confirmed. Also (I think) it's confirmed that you play as Roxas (my favorite) and there will be multiplayer.

Well, I think you can in the cell phone version, but that's currently only slighted for Japanese release.
The 358/2 Days is Roxas's story, and Birth by Sleep, is the KH prequel.
I personally like Roxas better and love the fact that 358/2 is on the DS, and is multiplayer! I'd love to play as Roxas and Axel (not so much Xigbar [the hardest Org. XIII member to beat in my opinion] and Saix).
I'm guessing that KH3 will come out two or three years after these titles hit the U.S. and Europe.

Here's some information that I found on KH Ultimania the URL is up above.

Kingdom Hearts: Birth By Sleep (PSP)
- Developed by the makers of KH: RE:CoM
- 3 Playable Scenarios with 3 Different Characters (Available in any order)
- Battle System draws inspiration from both KH & KH:CoM (inc. Timing System)
- Nomura comments that the story is complex, serious and varied

Kingdom Hearts: 358/2 Days (Nintendo DS)
- Developed by the makers of FF Fables: Chocobo Tales (h.a.n.d)
- Multiplayer Mode is all mission-based & any Org. XIII member is playable
- Story illustrates the daily life of Organization XIII
- 14th Organization Member is not Namine

Kingdom Hearts: Coded (Mobile)
- Developed by the makers of FF7: Before Crisis
- Game is planned to be released internationally
- Disney Worlds will be released as individual episodes (similar to FF7:BC)
- Graphics use 2D sprites overlayed on 3D Backgrounds
- Will explain the mysteries surrounding Riku & King Mickey (KH1 Ending)

They got this from Famitsu Magazine, the leading video game magazine in Japan.

Three Five Eight Over Two Days (Official Pronunciation) may come first, followed by Coded, then Birth By Sleep.

You are wrong. Roxas is the Best! (then comes Sora)