I don't think there are many parts of the P2 is shared with the P3 Standard.
The only thing I can see is the remote "looking" the same. The Standard uses a 15.2V 4800mah battery so I think the entire internals have also changed. They also mentioned the standard being lighter than the p3adv and pro and therefore 25min flight times. If its lighter than the P3Adv and Pro, then I think they wont be using any p2 parts.
Correct, there's not much of anything from a p2 in the P3 standard. Even the TX.