Hi Laurens,
The "v3" kit has the following differences:
Latest 16A version includes upgraded and replaced parts HS1057, HS1058, HS1059, HS1002-1, and HS1004-1.
You can search for those part numbers on the align site to see the exact parts being replaced but this wont make much difference to you if you have never owned a TREX before so i will try to break it down for you simple and easy:
Basically the new kits comes with:
*** New rotorhead with 4 o-rings which makes for a stiffer head dampening meaning better tracking and flight characteristics
*** New main gear design with fan to help cool the motor
*** new flybar control arms to prevent binding from interaction with the mixing levers
*** New bearings in the collective lever pivot points for smoother operation and less slop
*** New landing gear
And a few other minor changes. These kits were made in March 2005 so just under 2 months ago and the manufacture date is on the back of the manual so you can verify this yourself when you get the kit to be certain you are getting the newest version of the kit.
We will also be getting the new CDE and HDE kits from Align as well
http://www.mfis.net/microflight/shop/index.php/cPath/40_41
but the time frame and price are not certain yet. I expect this to NOT be an entry level Heli as it will be priced quite a bit higher. Im expecting between 200-230 EURO or so. Might be less or it might be more. Align hasnt announced a price officially yet so we have to wait and see.
The parts from the new HDE heli are essentially the same as the new "v3" kits but in black instead of grey and a few of them have some improvements to the design. If you own an older V3 TREX you can replace all parts from the new CDE and HDE helis on your older V3 as well.
Hope this answers your questions and sorry for doing it in english. Its way too much for me to be able to explain in dutch.