So the real question is, which Rayquaza will it be? We've only really seen 2 Big Basic Ray concepts used since BW, so will it be....
(insert drum roll here)
#1: Stack 2 different types of Energy (and maybe discard them) to do big damage Rayquaza
#2: Make a big bench to do big damage because TPC already forgot Eternatus VMAX exists and does the same thing Rayquaza
My guess is on #1.
You guys are forgetting Rayquaza will most definitely be a Rapid Strike card, and those types of big attacks with OHKO potential are more akin to the Single Strike side of things, so it will probably be something different for it this time, hopefully something interesting. I love Rayquaza.