I found this link on the DJI Forum, it was in German so I used a translator.
http://forum.dji.com/forum.php?mod=view ... D1&lang=en
http://www.drohnen-forum.de/inde ... -3-0-umr%C3%BCsten/
There is more in the post like about shielding but the following caught my eye;
3. ESC, propellers and engines
The new engines should be available as spare part, but can only be installed if new ESC's are installed v2.
The good news, the V.2 ESC's are installed for a long time in the vision, look in, if V2 is available on the ESC's bottom, where the Elko, then the new haste already. The chance is very high. If not need the old ESC's are replaced with the engines. When ordering make sure that delivered the v2.0. This is the outside of the bag.
The new 9450 propeller can be used with both the old and the new engines. Most, bring the improve with the new engines, but also by the old engines, the flight characteristics.
The new 2312 motors per motor, lift 200 grams more weight than the old 2212 engines. But it's not just about the weight, which can be lifted, but also to the force applied by the motor. This can, for example, in strong winds aloft, ever make the difference between a Flyaway and a safe return.
5. compass
The compass can be probably not so readily exchange. In the "old" Vision Plus, he is connected to the GPS module and the V3.0 on the motherboard. To what extent is compatible with the plug, I do not know. Those who try anzucrimpen Steckerchen, the ribbon cable that goes above could be replaced by a shielded round cables.
Now the old removed parts such as engines or spark, one can sell on Ebay etc., which introduces a small part of the cost back.