Based on all the info I have gathered so far this is the ratio -
5-6 Prime Pokemon per Box
3 Legend Pokemon per Box
Alph Lithograph is atleast 1 in 3 boxes if not RARER.
Red Gyarados I am unsure, but from everyone I have asked it seems to be 1 per box with it alternating from RH to Holo.
It seems that TPCi messed up again in NOT printing the Energy in RH, but I have only had one person confirm that they didn't pull any.
I hope that helps. I expect that the value of the set is going to be interesting. I am not sure if what to think as far as what is in each box.
Hope that helps,
Drew