While no one knows the answer to the above question, people do get hints.
Every time RIM (makers of our beloved Blackberry) file for a patent in the US, several site, such as UnwiredView.com descend upon them and dissect them to bits.
E.g., these latest 2 patents "SYSTEM AND METHOD OF INTEGRATING A TOUCHSCREEN WITHIN AN LCD" and "HANDHELD MOBILE COMMUNICATION DEVICE WITH MOVEABLE DISPLAY/COVER MEMBER", accompanied by some interesting images:
As can be seen, the screen would be tilted at an angle to the keyboard, allowing you to treat your Blackberry as a tiny laptop. They're also toying with the idea of a roller to replace the pearl (hope they won't take that route - I find the pearl highly intuitive and useful).
Probably the only people who won't like this new direction, will be companies like iGo, who make products like this ($38 on Amazon for the Bluetooth collapsible model):