This is something interesting but nothing decided or concrete on it.
I would try to seperate in your mind retail and classic. Something you buy on retail shouldn’t give you something in Classic, or vice versa. The philosophy is pretty rock solid that they are separate gameplay wise. If you obtained the original CE pets you used those/can still use those in the live game you obtained it for.
It is an interesting thought though, that to some that did have it, that was a part of their classic experience. It’s likely we won’t implement something that ties into the existing things you own on the live game, but maybe reoffer them since Classic is it’s own thing. Before the fury of that statement sinks in, I’m not saying that will happen at all (there literally hasn’t even been a discussion of it), just sharing my thoughts on a solution to that problem that I could see.
This also could be an exception where we somehow grant them for original CE owners. No idea. Interesting thing to think about though. I’ll mention it though that you guys are asking about the original CE pets for original CE owners.