I finally received my EotE Corebook today!
It is a gourgeous looking and solid book, but from the reviews I have seen of the product they had a little booklet inside it that read "read this first".
At first I thought I had received an incomplete product, but checking out one of the reviews again, it seems that the booklet and introduction has been made part of the actual core book now.
Does anyone know what happened to the booklet?

It was incorporated in later printings from what I gather.

It was incorporated in later printings from what I gather.

You gather correctly.

They probably reconsidered the value of having it as a separate booklet when they'd need to print it separately and package it with the main book. I figured it was cheaper to make it part of the book itself.

They probably reconsidered the value of having it as a separate booklet when they'd need to print it separately and package it with the main book. I figured it was cheaper to make it part of the book itself.

Or they realized too late during the first printing that they wanted it, so it got printed separately and was later incorporated in the 2nd printing and after.

Yep, I have the second printing with it include in the book text