Check out the Nokia patent filed in June 2007 for touch screen mobile phone control. Gives a few clues how the symbian s60 powered Tube will interface with the user.

What do we know about the specification of the Nokia Tube?
Nokia spokesman Kasey Farrar announced in an interview yesterday that the Tube would have:

Touch based interface
Symbian operating system (s60)

Farrar also alluded to Linux capabilities of previous Nokia devices, notably the N800 and N810 internet tablets.
Infoworld revealed that the Tube will also have:

Java
Photo uploading capabilities
Video playback; […]