Upgrade-able processor(send in) and memory(send in) and the option to remove/keep/and re-install the on-board manual which probably takes up a considerable amount of the memory.
I believe the USB is an alright idea, and they already had the wireless transfer of programs from one V3 to Another but hardly anyone used that feature(course the v3 was new so hardly any V3's were out there yet to test long term of this feature) and I thought that I read that that feature was pulled from the V3i and the on-board manual was installed(I remember saying to White's to add an on-board manual before they did, which it was explained would take memory away from the V3i, but was a good idea).
Your own programmable VDI Numbers, lighted keypads would be cool, auto adjust back-light that adjust with lighting conditions, waterproof, GPS??, Lipo or Lithion Ion battery system, the ability too add or make your own Lipo batteries for it(I know with rc cars you can get a 11.1V, 5,000-8,000 Mah batteries for them and these would be great in a V3iD,V3iUG,V3i2,V3i-SE,V3i-XSP(Xtra Special Purpose) The use of all frequencies and the option to make a program that uses the best of or your choice of frequencies, the ability to detect a dime sized object at a depth of 14 inches in any soil condition, auto ground balance and frequency shift and frequency choice dependent on EMI and other detectors in the vicinity.
Carbon Fiber upper,middle and lower shafts, better plastics for the cam-locks, removable box from the upper rod or the ability to move it forward or back dependent on balance when using different coils or personal preference. The Ability to move the Screen Pod up,down,left,right to face the user whether the user is left or right handed. Some of these features would make it so that it is not as rugged,like the screen pod it or would be a weak point of breakage. This could be solved by having it lock into place, a stronger plastic and or that could be an option/feature you can buy and add on by removing the pod and adding an adapter into the top of the handle and snapping the pod on/off or it is held on by a screw/bolt and nut. maybe a Pistol grip handle/ or pistol grip add on feature(new Rubber to slide over the metal handle by removing the pod, removing the foam handle and adding/ sliding on a pistol grip that forms more naturally to the shape of a hand.
This is all I can come up with right now. I need to go and begin looking for work again, it is hard to find work in my area and having applied to over 100 jobs of careerbuilder.com and with just a few calls seems worthless. Now if I could just work for White's to come up with new idea's I would be all set