Maybe not n900, but n910 definitely:
holographic projection & capture
teleportation network between the devices
mind reading for easier controls

for the n900, I'd settle only for:
future prediction
antigravitational pad to make it weightless

considering when the n910 will be out (looking at the time elapsed beteen device), this might actually happen
note: i'm not complaining; every device (except n810) had great improvements