Sorry I dont see the relevance of this, this is not from the looks of it anything related to BlackBerry. It looks like a big ol' scientific calculator and it does not look like it will be easy to type with.
But without a poor QWERTY keyboard implementation. BTW, I started my project at Sony Ericsson Developer World forum three months ago just concerning SE P910.
Finally, I've found the proper form factor (101x55 mm) and now the ring finger also has its own domain for typing as to my initial plan. The system of typing is as following:
The "A-F" keys and Space key are intended for the index finger, "G-T" keys for the middle finger and "U-Z" keys for the ring one.
There are lots and lots of reasons why QWERTY is a poor keyboard layout, even for regular PC usage, however, it is used, and it is familar and that is why we love QWERTY :D