Hmmm... I don't things will change THAT much over the next 10 years or so... but I do think these thing are likely:
1) Smaller, faster, smarter computers... WiFi wireless connections in everything; TV, DVD player, PC, keyboard, mouse, Speakers, watch, mobile etc...
Connectivity will be very important and you will be able to interface with any device you own... yes, probably including the fridge if you want to.
2) In terms of actual interfaces, I think things will most likely stay in the realms of 2D for the moment, however I can see some forms of subtle 3D interfaces catching on - where your windows basically 'hover' slightly above other ones but something too drastic, and certainly no voice activated 3D fly throughs of your system files (that may be possible, but not particularly practical or mainstream).
3) Actually, I think vector-based interfaces may catch on, because they can be dynamically re-sized all over the place without loss of quality (and are already being used in the latest Apple OS's)
I envision a time where you can wirelessly load a dynamic vector 'skin' into any device and totally customize the look and feel of that interface - whether it be your TV's menus, your winamp skin or the watch that your wearing.
4) I also believe that mobiles will eventually get small enough to basically become watches.
You will have a fold out or flip up hi-res screen, and this voice-activated device will be your mobile for video phone calls, your TV & HiFi remote, your portable radio & mp3 player, your personal organizer and wireless interface to the Net and all the devices in your house.
It will be with you at all times, and it will revolutionize the way you live, work, play and interact with the world... and I don't think it's too far off (certainly within 10 years).
The interface on these watches will be skinnable to reflect your personal tastes and style, and they will be the accumulation of all modern technology into 1 single device.
They will obviously be various 'versions' and models - with some being able to monitor your heart beat and vital signs and send them wirelessly through the net to the local hospital if you want, all of them will be able to video conference with anyone as standard, and even multi-video conference if needed with dozens of other advanced features that consumers will demand from them... oh and some might even tell the time
The future will be an interesting place, not too different from today, but technology will always evolve into new shapes and forms as we grow more and more dependant on it, and demand more and more from it.