What is there to get? It's a sequel made by a new developer.
I personally think of the IE games as modules in the same rule set, that being the IE engine as well as 2nd Ed. D&d. There's no reason why there could not be a continuation of those old modules with new rules, E. G. A new engine as well as new d&d edition. The only thing that seems to be bothering people is the number at the end, signifying a direct sequel instead of a spin off. If that is the case, maybe you should take a long look into the mirror and ask yourself, do I really want to be this pedantic?