Mostly pretty good, but a few gripes:
I hope the nemesis weapons upgrade from swords to halberds is wrong, I currently have a mix of them in my unit and anyone with an existing GK army is going to be effectively blackmailed into paying for the upgrade if they want to be WYSIWYG compliant as they almost all currently have halberds.
I'd also be surprised if stormtroopers are gone for good (I think making them like wracks in the DE codex would be best i.e. elites unless an inquisitor is taken).
... and no more jaws style 'removing from play' stick with the instant death mechanic.