A friend sent me this article by Surur, regarding the rumored Windows Phone 8 keyboard:
The keyboard is designed for one-handed thumb typing without having to look and features several keys clustered together, leveraging disambiguation to decide what word is in fact being typed.
Clearly this is geared towards bigger phones, because the iPhone is pretty easy to type on with one hand if need be. Seems like an interesting concept though.
(via Tech Digest)