You are right Shin, but Yamato has experience in, and already put a 1/72 YF-19 "perfect transformation" out in the streets.
They need to make aesthetic changes to a toy which they already have worked with and know the transformation process very well.
It can't be so difficult. I rather think they don't expect too many sales to justify redesigning this toy.
Edit:
Forgot to add that if they use diecast and POM in some key areas the toy shouldn´t be fragile at all. The current 1/72 is almost undestructible. So they can give us a better toy at the same scale. If they choose a bigger scale then I'll be extremely happy and sure it will be easier for Yamato to work with.
There is no official info, Yamato is too quiet about this!!!