There was a lot of previous discussion on this following the benchmark release but many people tried to temper speculation by saying Ifrit-egi's increased size might just be for the video. Fair enough.

We have a new screenshot (looks like a boss fight from the Great Library in Sharlayan) released from a press event:



I know some people will try to argue perspective on this one but we can triangulate the egi's relative position fairly easily since he's positioned between three characters. He's considerably taller than the female Au'Ra to the right and ever so slightly taller than the male Au'Ra positioned behind him in the screenshot. We know the males are roughly the same height as male Elezen so he's definitely considerably larger than he used to be.

I'm curious to see if Titan and Garuda received the same treatment. Would seem a little odd for only one pet to get such an upgrade...