What did they refresh?
Well they seemed to take almost everything interesting out of the DE book, so yes it is a surprise to see interesting things in a base codex. What new models did we get- frak all- one new kit which looks the same as an old one.
What did they do other than remove model options?
Although it is impossible to "nerf" new content, it is possible to make new content with bad rules- which GW have not done.
AdMech, and even eldar, have movement rules Deldar players should be lusting after. Not just extra movement, but scout across the board. Instead our movement rules are crap, our book is crap, and the release was, a huge pile of utter crap.